Trial of the Worm

Trial of the Worm is a player-vs-environment (PvE) game mode in Back 4 Blood. It has been announced on November 8, 2022 alongside the River of Blood expansion, which has been released on December 6, 2022. The game mode is available for all players and does not require an expansion to be accessed. Players can tackle the mode alone in Offline Mode or in a pre-made group, or find teammates via the matchmaking system. Trial of the Worm can be either accessed via the player's menu or by interacting w

“ Just wanted to say...your last run was EPIC!

— Kenny

„

Trial of the Worm is a player-vs-environment (PvE) game mode in Back 4 Blood. It has been announced on November 8, 2022 alongside the River of Blood expansion, which has been released on December 6, 2022. The game mode is available for all players and does not require an expansion to be accessed. Players can tackle the mode alone in Offline Mode or in a pre-made group, or find teammates via the matchmaking system.

Overview[]

TotW Kenny's Tent

Kenny's tent that allows access to the Leaderboards.

Trial of the Worm can be either accessed via the player's menu or by interacting with General John Phillips/the other characters in Hope. This mode offers a four-player co-op experience that gives players a new type of challenge.

The mode plays almost identically to the Campaign mode in terms of content, so players will be familiar with the mechanics overall. Once a Mission has been started, it will be played as if it were in Campaign mode, with one difference being that while the six Hives would always have the Skull Totem Task, the regular Campaign Missions would always keep a Silence Is golden challenge. This means that if a team has selected, for example, the Resurgence Mission, the Cleaners will have to move from the Saferoom they started in to the destination Saferoom. Trial of the Worm features a gauntlet of four Missions, that players can run through to collect a Bonus of 75% more Supply Points Supply Points over Recruit, just like the Veteran Difficulty. The default number of Fabulous Mementos is five and they can be increased by the Player Modifier Tree up to six to eight in total. Ugly Chachkies is the only inactive card in this mode, which would still be available to pick up at a Deck / randomly in Mission Intel boxes, but would have no effect.

Players will be able to apply Corruption Modifiers that will not only increase the replay value, but also the challenge that awaits them. There are Corruption Modifiers, grouped in four main categories, each of them having 15 points, i.e. 60 modifier points in total. The mode also features a score system alongside an online Leaderboard.

Players may use Burn Cards, but the Hell Can Wait card cannot be used, as no Continous will be available to them.
In addition, the Cleaners will have access to the Vendor in each Mission and the KSC Vendor Crates within Ridden Hives will feature all supplies that the regular vendor crates have to offer.

Completing Missions within the Trials of the Worm game mode will count towards the progression of Accomplishments that require a certain feature inside Campaign Missions to be completed, but will not count those Missions as accomplished, e.g. it will not mark Act 5 as completed in Nightmare/No Hope if those are done in Trial of the Worm, although secrets inside those would be available to find and achieve.

Score System[]

The mode features a score system, that allows players to compare with other Cleaners at Personal/Friends and Regional Score tables in the Leaderboards. To earn score points, players can complete Mission objectives or collect a new Memento type, dubbed Fabulous Memento. There are 5 Fabulous Mementos in each Mission by default, the number of which can be increased by spending points in the Player modifier category. The score multiplier can reach a maximum of x51., with the Horde, Ridden and Player max. bonus multipliers being x10, while the Difficulty's max. is x20. The base x1 adds to the score of up to x50 for the total of x1 to x51 .

Corruption Modifiers[]

The mode will offer four categories of modifications: Difficulty, Ridden, Horde, and Player. Each of these categories can be boosted up to 15x and grants an increased score multiplier. Players have 1 minute and 30 seconds to choose their preferred Corruption Modifiers. These modifiers can stack as for example the +5% Damage-modifier from the Ridden category can become a +15% Damage-modifier.

Difficulty[]

TotW Modifier Difficulty

Difficulty Modifier

Players basically start at the lowest difficulty level, which is Difficulty Modifier: Recruit Recruit, but with each subsequent level the difficulty is gradually increased. While the usual Campaign Mode's Recruit, Veteran, Nightmare and No Hope are all implemented as their first rank (I), they can also be buffed to intermediate higher ranks, up to III. There is also a fifth difficulty - Legendary, that has four ranks, unlike the lower difficulties. It functions as a harder difficulty level than No Hope, with the differences of further lowering Trauma Resistance and increasing the Riddens Strength and Friendly Fire.

Rank Modifier Score Multiplier Difficulty Settings
Rank 0 Difficulty Modifier: Recruit I Recruit I +0 Bonus Stats: NORMAL
Trauma Resistance: HIGH
Ridden Strength: NORMAL
Event Difficulty: Normal
Extra Lives: 1
Friendly Fire: NONE
Roaming Bosses: 1
Rank 1 Difficulty Modifier: Recruit II Recruit II +0.15
Rank 2 Difficulty Modifier: Recruit III Recruit III +0.15
Rank 3 Difficulty Modifier: Veteran I Veteran I +0.75 Bonus Stats: LOW
Trauma Resistance: NORMAL
Ridden Strength: NORMAL
Event Difficulty: NORMAL
Extra Lives: 1
Friendly Fire: LOW
Roaming Bosses: 1
Rank 4 Difficulty Modifier: Veteran II Veteran II +0.35
Rank 5 Difficulty Modifier: Veteran III Veteran III +0.35
Rank 6 Difficulty Modifier: Nightmare I Nightmare I +1.5 Bonus Stats: NONE
Trauma Resistance: LOW
Ridden Strength: HIGH
Event Difficulty: HARD
Extra Lives: 1
Friendly Fire: HIGH
Roaming Bosses: 1
Rank 7 Difficulty Modifier: Nightmare II Nightmare II +0.75
Rank 8 Difficulty Modifier: Nightmare III Nightmare III +0.75
Rank 9 Difficulty Modifier: No Hope I No Hope I +3 Bonus Stats: NONE
Trauma Resistance: VERY LOW
Ridden Strength: VERY HIGH
Event Difficulty: VERY HARD
Extra Lives: 0
Friendly Fire: VERY HIGH
Roaming Bosses: 1
Rank 10 Difficulty Modifier: No Hope II No Hope II +1.25
Rank 11 Difficulty Modifier: No Hope III No Hope III +1.25
Rank 12 Difficulty Modifier: Legendary I Legendary I +4 Bonus Stats: NONE
Trauma Resistance: LOWEST
Ridden Strength: DANGEROUS
Event Difficulty: VERY HARD
Extra Lives: 0
Friendly Fire: DANGEROUS
Roaming Bosses: 1
Rank 13 Difficulty Modifier: Legendary II Legendary II +1.5
Rank 14 Difficulty Modifier: Legendary III Legendary III +1.75
Rank 15 Difficulty Modifier: Legendary IV Legendary IV +2.5

Ridden[]

TotW Modifier Ridden

Ridden Modifier

The Ridden category offers a variety of ways to boost Common Ridden and Mutations. The following is a breakdown of the individual ranks and the individual modifiers per rank:

Rank Modifier Score Multiplier
Rank 1 Ridden Modifier: Damage +5% Damage +0.1
Rank 2 Ridden Modifier: Mutation Melee Speed +20% Mutation Melee Speed +0.15
Rank 3 Ridden Modifier: Extra Slow from Common Attacks +10% Extra Slow from Common Attacks
Ridden Modifier: Common Health Regen +1 Common Health Regen
Ridden Modifier: Mutation Health Regen +15 Mutation Health Regen 		+0.2
Rank 4 Ridden Modifier: Fire Resistance +15% Fire Resistance
Ridden Modifier: Explosive Resistance +15% Explosive Resistance 		+0.25
Rank 5 Ridden Modifier: Damage +5% Damage
Ridden Modifier: Corruption Card Difficulty +1 Corruption Card Difficulty 		+0.3
Rank 6 Ridden Modifier: Mutations recover from Stumble faster Mutations recover from Stumble faster +0.4
Rank 7 Ridden Modifier: Extra Slow from Common Attacks +10% Extra Slow from Common Attacks
Ridden Modifier: Common Health Regen +1 Common Health Regen
Ridden Modifier: Mutation Health Regen +15 Mutation Health Regen 		+0.5
Rank 8 Ridden Modifier: Fire Resistance +15% Fire Resistance
Ridden Modifier: Explosive Resistance +15% Explosive Resistance 		+0.6
Rank 9 Ridden Modifier: Damage +5% Damage
Ridden Modifier: Corruption Card Difficulty +1 Corruption Card Difficulty 		+0.7
Rank 10 Ridden Modifier: Mutation Melee Speed +30% Mutation Melee Speed +0.8
Rank 11 Ridden Modifier: Extra Slow from Common Attacks +10% Extra Slow from Common Attacks
Ridden Modifier: Common Health Regen +1 Common Health Regen
Ridden Modifier: Mutation Health Regen +15 Mutation Health Regen
Ridden Modifier: Common Attacks remove Max Health Common Attacks remove Max Health 		+0.9
Rank 12 Ridden Modifier: Fire Resistance +15% Fire Resistance
Ridden Modifier: Explosive Resistance +15% Explosive Resistance 		+1.05
Rank 13 Ridden Modifier: Mutation Weakspot bonus removed Mutation Weakspot bonus removed +1.2
Rank 14 Ridden Modifier: Headshots Only on Common Headshots Only on Common

(Bullet & Melee hits on the body/limbs won't damage Common Ridden)

+1.35
Rank 15 Ridden Modifier: Damage +15% Damage
Ridden Modifier: Corruption Card Difficulty MAX Corruption Card Difficulty 		+1.5


At Rank 15, players will have to deal with the following 12 Ridden modifiers:

Modifier
Ridden Modifier: Damage +30% Damage
Ridden Modifier: Mutation Melee Speed +50% Mutation Melee Speed
Ridden Modifier: Extra Slow from Common Attacks +30% Extra Slow from Common Attacks
Ridden Modifier: Common Health Regen +3 Common Health Regen
Ridden Modifier: Mutation Health Regen +45 Mutation Health Regen
Ridden Modifier: Fire Resistance +45% Fire Resistance
Ridden Modifier: Explosive Resistance +45% Explosive Resistance
Ridden Modifier: Corruption Card Difficulty MAX Corruption Card Difficulty (3rd)
Ridden Modifier: Mutations recover from Stumble faster Mutations recover from Stumble faster
Ridden Modifier: Common Attacks remove Max Health Common Attacks remove Max Health
Ridden Modifier: Mutation Weakspot bonus removed Mutation Weakspot bonus removed
Ridden Modifier: Headshots Only on Common Headshots Only on Common

(Bullet & Melee hits on the body/limbs won't damage and kill Common Ridden)

Horde[]

TotW Modifier Horde

Horde Modifier

The Horde category offers, among other things, the possibility to increase the number of Common Ridden and Mutations and to strengthen Boss Mutations. These Horde modifiers are available between Rank 1 and 15:

Rank Modifier Score Multiplier
Rank 1 Horde Modifier: More Common per Horde +5 Common per Horde +0.1
Rank 2 Horde Modifier: Mutation Variant(s) +1 Mutation Variant(s)
Horde Modifier: Hazard Density Level 1 Hazard Density 		+0.15
Rank 3 Horde Modifier: Common Variant(s) +1 Common Variant(s) +0.2
Rank 4 Horde Modifier: Boss Health +10% Boss Health +0.25
Rank 5 Horde Modifier: More Common per Horde +5 Common per Horde
Horde Modifier: Boss Stun Resistance Level 1 Boss Stun Resistance 		+0.3
Rank 6 Horde Modifier: Mutation Variant(s) +1 Mutation Variant(s)
Horde Modifier: Hazard Density Level 2 Hazard Density 		+0.4
Rank 7 Horde Modifier: Common Variant(s) +1 Common Variant(s) +0.5
Rank 8 Horde Modifier: Ferocious Bosses Ferocious Bosses +0.6
Rank 9 Horde Modifier: More Common per Horde +5 Common per Horde
Horde Modifier: Boss Stun Resistance Level 2 Boss Stun Resistance 		+0.7
Rank 10 Horde Modifier: Mutation Variant(s) +1 Mutation Variant(s)
Horde Modifier: Hazard Density Level 3 Hazard Density 		+0.8
Rank 11 Horde Modifier: Common Variant(s) +1 Common Variant(s) +0.9
Rank 12 Horde Modifier: Monstrous Bosses Monstrous Bosses +1.05
Rank 13 Horde Modifier: More Common per Horde +5 Common per Horde
Horde Modifier: Boss Stun Resistance MAX Boss Stun Resistance bonus removed 		+1.2
Rank 14 Horde Modifier: Mutation Variant(s) +1 Mutation Variant(s)
Horde Modifier: Hazard Density MAX Hazard Density 		+1.35
Rank 15 Horde Modifier: Chance for Roaming Boss Chance for +1 Roaming Boss +1.5


The following 8 Horde modifiers will empower the Horde at maximum Rank:

Modifier
Horde Modifier: More Common per Horde +20 Common per Horde
Horde Modifier: Mutation Variant(s) +4 Mutation Variant(s)
Horde Modifier: Hazard Density MAX Hazard Density
Horde Modifier: Common Variant(s) +3 Common Variant(s)
Horde Modifier: Boss Health +10% Boss Health
Horde Modifier: Boss Stun Resistance MAX Boss Stun Resistance
Horde Modifier: Monstrous Bosses Monstrous Bosses
Horde Modifier: Chance for Roaming Boss Chance for +1 Roaming Boss

Player[]

TotW Modifier Player

Player Modifier

The Player category, in addition to increasing the number of Fabulous Mementos, allows for a variety of negative modifications that limit the Cleaners' effectiveness.

Rank Modifier Score Multiplier
Rank 1 Player Modifier: Ammo Capacity -10% Ammo Capacity
Player Modifier: Vendor Prices +10% Vendor Prices 		+0.1
Rank 2 Player Modifier: Sprint Efficiency -10% Sprint Efficiency
Player Modifier: Move Speed while Firing -10% Move Speed while Firing 		+0.15
Rank 3 Player Modifier: Environmental Damage taken +25% Environmental Damage taken
Player Modifier: Chance to spawn broken items +10% chance to spawn broken items 		+0.2
Rank 4 Player Modifier: Ammo Capacity -10% Ammo Capacity
Player Modifier: Vendor Prices +10% Vendor Prices 		+0.25
Rank 5 Player Modifier: Sprint Efficiency -10% Sprint Efficiency
Player Modifier: Move Speed while Firing -10% Move Speed while Firing
Player Modifier: Fabulous Memento(s) +1 Fabulous Memento(s) 		+0.3
Rank 6 Player Modifier: Environmental Damage taken +25% Environmental Damage taken
Player Modifier: Chance to spawn broken items +10% chance to spawn broken items 		+0.4
Rank 7 Player Modifier: Ammo Capacity -10% Ammo Capacity
Player Modifier: Vendor Prices +10% Vendor Prices 		+0.5
Rank 8 Player Modifier: Sprint Efficiency -20% Sprint Efficiency
Player Modifier: Move Speed while Firing -20% Move Speed while Firing 		+0.6
Rank 9 Player Modifier: Environmental Damage taken +25% Environmental Damage taken
Player Modifier: Chance to spawn broken items +10% chance to spawn broken items 		+0.7
Rank 10 Player Modifier: Fabulous Memento(s) +1 Fabulous Memento(s)
Player Modifier: Team Extra Lives -1 Team Extra Lives 		+0.8
Rank 11 Player Modifier: Ammo Capacity -10% Ammo Capacity
Player Modifier: Vendor Prices +10% Vendor Prices 		+0.9
Rank 12 Player Modifier: Sprint Efficiency -30% Sprint Efficiency
Player Modifier: Move Speed while Firing -30% Move Speed while Firing 		+1.05
Rank 13 Player Modifier: Vendor Prices +30% Vendor Prices
Player Modifier: Chance to spawn broken items +10% chance to spawn broken items 		+1.2
Rank 14 Player Modifier: No Friendly Cleaner Outlines No Friendly Cleaner Outlines
Player Modifier: Teammate Status shrouded Teammate Status shrouded 		+1.35
Rank 15 Player Modifier: Fabulous Memento(s) +1 Fabulous Memento(s)
Player Modifier: Team Extra Lives -1 Team Extra Lives
Player Modifier: All Accessory Slots -1 All Accessory Slots 		+1.5


On the highest settings, players will be affected by the following 11 modifiers:

Modifier
Player Modifier: Ammo Capacity -40% Ammo Capacity
Player Modifier: Vendor Prices +70% Vendor Prices
Player Modifier: Sprint Efficiency -70% Sprint Efficiency
Player Modifier: Move Speed while Firing -70% Move Speed while Firing
Player Modifier: Environmental Damage taken +75% Environmental Damage taken
Player Modifier: Chance to spawn broken items +40% chance to spawn broken items
Player Modifier: Fabulous Memento(s) +3 Fabulous Mementos

(for a total of 8)

Player Modifier: Team Extra Lives -2 Team Extra Lives
Player Modifier: No Friendly Cleaner Outlines No Friendly Cleaner Outlines
Player Modifier: Teammate Status shrouded Teammate Status shrouded
Player Modifier: All Accessory Slots -1 All Accessory Slots

Corruption Cards[]

In addition to new cards, the Corruption Cards receive two new types: Boons and Curses. These additionally support or make it more difficult for the Cleaners to successfully complete a Mission in addition to the usual Corruption Cards.

In Trial of the Worm, all Corruption Cards have a level, which reflects the approximate beneficial or detrimental potency. The higher the level, the stronger the positive or negative impact of the card. Below is an example of three level variations of a card.

Curse Cards Level Comparison

The Curse Card Increased Incoming Damage at Lv15, Lv35, and Lv45.

Boons[]

Boons are powerful enhancements for the Cleaners that increase their chances of successfully completing a Mission.
To keep the overview simple, variants of Boon cards have been omitted from the list.

Card Art Title Description
Card 01 BonusAgility Bonus Agility Swap Speed, ADS Speed, and Reload Speed are increased by 25%
Card 01 BonusCurrency Bonus Currency Additional Copper spawns in the environment
Card 01 BonusDamage Bonus Damage Damage dealt to Ridden is increased by 25%
Card 01 BonusIntel Bonus Intel More Intel spawns in the environment
Card 01 BonusLifeAndReviveSpeed Bonus Life And Revive Speed All Cleaners receive 1 Extra Life and have 100% faster Revive Speed
Card 01 BonusMaxAmmo Bonus Max Ammo Trauma Resistance is increased by 25%
Card 01 BonusTraumaResistance Bonus Trauma Resistance Trauma Resistance is increased by 25%
Card 01 Flamethrower Flamethrower A Flamethrower spawns in the Safe Room and additional Gas Cans are added to the environment
Card 01 LegendaryAccessories Legendary Accessories Legendary Accessories can be found in a Prepper Stash
Card 01 LegendaryAttachments Legendary Attachments Legendary Attachments can be found in a Prepper Stash
Card 01 LegendaryWeapon Legendary Weapon A Legendary Weapon can be found in a Prepper Stash
Card 01 TraumaRecovery Trauma Recovery Instantly recover 25 Trauma

Curses[]

Curses are the polar opposite of Boons. These cards make it more difficult for the Cleaners to successfully complete Missions.
For clarity, variants of Curse cards have been excluded from the list.

Card Art Title Description
Card 01 ADSDisabled ADS Disabled ADS is disabled
Card 01 ExtraLivesReduced Extra Lives Reduced Cleaners permanently lose an Extra Life
Card 01 FastBleedOut Fast Bleed Out Incap Bleed out Speed is increased by 25%
Card 01 HealingReduced Healing Reduced Healing Efficiency is reduced by 12.5%
Card 01 IncreasedIncomingDamage Increased Incoming Damage Incoming Damage is increased by 12.5%
Card 01 InstantTrauma Instant Trauma Cleaners receive Trauma Damage upon opening the Saferoom Door
Card 01 LossOfOffensiveSlot Loss Of Offensive Slot Offensive Slots are reduced by 1
Card 01 LossOfQuickSlot Loss Of Quick Slot Quick Slots are reduced by 1
Card 01 LossOfSupportSlot Loss Of Support Slot Support Slots are reduced by 1
Card 01 MaxAmmoReduced Max Ammo Reduced Max Ammo is reduced by 12.5%
Card 01 MaxHealthReduced Max Health Reduced Max Health is reduced by 12.5%
Card 01 NoCopper No Copper No Copper spawns in this Chapter
Card 01 NoExtraLives No Extra Lives Cleaners start with no Extra Lives
Card 01 ReducedAgility Reduced Agility Weapon Swap Speed, ADS Speed, and Reload Speed are reduced by 12.5%
Card 01 ReducedMobility Reduced Mobility Used Speed and Melee Speed are reduced by 12.5%, and Sprint Cost is increased by 12.5%
Card 01 RiddenStumbleResistance Ridden Stumble Resistance Ridden Stumble Resistance is increased by 12.5%
Card 01 SprintDisabled Sprint Disabled Sprint is disabled
Card 01 StaminaReduced Stamina Reduced Max Stamina and Stamina Regen are reduced by 12.5%
Card 01 StrongLockedDoors Strong Locked Doors Locked Doors are much harder to destroy
Card 01 VendorDisabled Vendor Disabled The Vendor is disabled
Card 01 VendorPermanentlyDisabled Vendor Permanently Disabled The Vendor is permanently disabled for the rest of this run

Mission Pool[]

TotW Mission Selection

An example of the Mission selection screen.

At the start and between each Mission, players will be able to select one of three randomly selected Missions. The Mission Pool includes most Campaign Missions from Act 1 to 6, including the Ridden Hives.
Ridden Hives can only be accessed via a Mission selection and Hive entrances are disabled within all Missions. The Inner layer, The Nursery cannot be played in this mode. Players have 1 minute and 30 seconds to choose their preferred Mission.
Players who don't own DLCs and are without a player who owns the DLC expansions such as Tunnels of Terror, Children of the Worm, or River of Blood will randomly be able to access Missions of those expansions via this mode, although the final Mission of the game (Behold the Harbinger) is an exception as the players will be able to access ten out of the eleven non-Hive Missions, although all six Hives would randomly be optional. The Inner Lair (The Nursery) won't be accessible as it counts as a sub-hive, outside of the regular Hives. Additionally, there are three base game Missions, that are likely not among the optional Missions. These are: The Sound of Thunder, Heralds Of The Worm Part 1, and Act 4: The Abomination itself. This means Trial of The Worm grants access to of 46 of the 51 Missions.

Passing the Missions and Hives via this mode will not grant the Mission-completion achievements like for Recruit/Veteran in Act 5 or 6. Despite of this, some of the DLC accomplishments, like finding the Secrets in the Hives and Acts 5 and 6 will register.

Leaderboard[]

TotW Leaderboard

The whiteboard that allow players to access the leaderboards.

Players can access an online leaderboard by either interacting with the whiteboards in Kenny's tent or selecting it using the menu. The leaderboard offers a comparison between all players of a region and the filter option of how one's friends have performed so far.

TotW Leaderboard Comparison

The leaderboards.

The following information are displayed while looking at the leaderboard:
Name, System, Score, Multiplier, and Timed Played. In addition players will be able to jump to the top of the leaderboard and toggle through platforms via a keybinding.

Achievements[]

Trial of the Worm must be accessed in order to satisfy the unlock conditions for the following Achievements / Trophies:

Image Name Description

Achievement DLC03 001

 The Path To Glory Complete a map in Trial of the Worm with a total modifier of at least x20.

Achievement DLC03 008

 A Can Of Worms Play Trial of the Worm for the first time.

Achievement DLC03 011

 Going For Broke Earn a score of at least 100,000 in Trial of the Worm.

Trivia[]

  • On November 23, 2022, an individual responsible for managing the official Facebook account of Back 4 Blood posted the following comment:
“ The wiki article on Trial of the Worm is inaccurate.
We're not sure where the information is coming from.

— Facebook user managing the Back 4 Blood Facebook account

„

However, it was later revealed that this statement from the official Back 4 Blood Facebook page was entirely inaccurate, as all the information in the article was, in fact, correct at the time. It appears probable that the user in question lacked access to the Trial of the Worm mode, leading to the dissemination of this erroneous statement.

Gallery[]

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