Weekly Outbreaks

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Weekly Outbreaks in Killing Floor 2 are the special variations of normal survival mode with the specific mutator-a-like twists that modify certain gameplay elements making the game more challenging or forcing players to pickup specific strategies and loadouts in order to survive. There are currently 8 possible Outbreaks, with one available each week. It changes over on tuesday evenings (US time). Completing a Weekly Outbreak will earn players cosmetic rewards and 500,000 Vosh (cosmetic in-game currency) which is enough to acquire one Vault Crate that contains player accessories and weapon skins to customize your character.

Original 8 Weekly Outbreaks (from Boom to Beefcake) were added in the game on June 13, 2017, as a part of the Summer Sideshow update. Two more Outbreaks were added in 2021's Dystopian Devastation update.

Boom

Killing Floor 2 horzine weekly outbreak
Boom
Zeds under pressure; may explode.
Maybe it was something they ate? Bad gas? Whatever it was, Zeds explode when killed in this outbreak.
Start Date
End Date
Killing Floor 2 Weekly Outbreaks - Boom
Outbreak Completion Reward
Weekly | Mind Blown
Related Achievements

Zeds under pressure; may explode.

Gameplay specifics:

  • Explosive ZEDs: ZEDs explode on death.
  • Difficulty - Hard, Waves - 7.
  • Explosion: Damage - 35, Radius - 4.5m, Falloff exponent - 2, Damage type - Explosive.
  • Explosion (Bloat, Scrake, Fleshpound, bosses): Damage - 35, Radius - 5.5m, Falloff exponent - 2, Damage type - Explosive.
  • ZEDs do not take any damage from the explosions.
  • Fleshpounds spawn already enraged.



Cranium Cracker

Killing Floor 2 horzine weekly outbreak
Cranium Cracker
Brain damage is the best damage.
In this outbreak, the Zeds have mutated such that they can only be put down for good with damage to the head.
Start Date
End Date
Killing Floor 2 Weekly Outbreaks - The Cranium Cracker
Outbreak Completion Reward
Centerfire | Headshot Weekly | Mint
Related Achievements

Brain damage is the best damage.

Gameplay specifics:

  • Abomination health scale - x0.6, shield scale - x0.75 (Abomination Spawn health scale - x0.25).
  • E.D.A.R variants health scale - x0.05.
  • Hans health scale - x0.4, shield scale - x0.75.
  • Husk has a 100% chance to be replaced by Bloat.
  • King Fleshpound health scale - x0.75, shield scale - x0.5.
  • Matriarch has a 100% chance to be replaced by Patriarch.
  • Note that shield HP also depends from the actual health scale.
  • Patriarch health scale - x0.5.
  • Quarter Pound health scale - x0.9.
  • Stalker has a 100% chance to be replaced by Alpha Clot.


Tiny Terror

Killing Floor 2 horzine weekly outbreak
Tiny Terror
A small threat is still a threat.
Shooting Zeds in this outbreak will cause them to shrink, making them harder to hit.
Start Date
End Date
Killing Floor 2 Weekly Outbreaks - Tiny Terror
Outbreak Completion Reward
Weekly | Tiny Terror Hat | Precious
Related Achievements

A small threat is still a threat.

Gameplay specifics:

  • Shrinking ZEDs / players: ZEDs and players have their size scaled based on their health percentage.
  • Difficulty - Suicidal, Waves - 7.
  • Size scale at 100% HP - x1, Size scale at 0% HP - x0.5.



Bobble Zed

Killing Floor 2 horzine weekly outbreak
Bobble Zed
...that must hurt their necks.
Something went horribly wrong with this batch of Zeds and their heads are wwwaaaayyyyyyy larger than normal! Huge even!
Start Date
End Date
Killing Floor 2 Weekly Outbreaks - Bobble Zed
Outbreak Completion Reward
Weekly | Horzine Helmet | Precious
Related Achievements

...that must hurt their necks.

Gameplay specifics

  • Enlarged head size: ZEDs and players have bigger heads. ZEDs have more health and only die when their body health is depleted.
  • Difficulty - Suicidal, Waves - 7.
  • ZEDs head size scale - x2.7, Players head size scale - x2.
  • No head dismemberment allowed. ZEDs cannot be killed by taking off their head health and only die when they ran out of body health.
  • It should be noted that ZEDs still take extra damage to body health upon draining their head HP (see step 9 of Damage To Take mechanics). The other side affects might occur, such as upon taking sufficient damage to the head Quarter Pounds and Fleshpounds become unable to enrage due to having a negative head HP value.
  • ZEDs spawn much faster (x2.5 spawn rate multiplier).
  • Each wave contains only 70% of the base wave AI amount.
  • All ammo has 50% discount.
  • Matriarch has a 100% chance to be replaced by Hans.
ZEDs have their health and headhealth adjusted by following multipliers:
ZED: Health scale: Head health scale:
Abomination x1.5 ---
Alpha x3 x4.5
AlphaKing x3 x3
Bloat x1.5 x1.5
Crawler x3 x5
CrawlerKing x3 x5
Cyst x3 x4.5
Fleshpound x2 x1.5
Gorefast x3 x2
Gorefiend x3 x2
Hans x1 ---
Husk x2 x2.5
King FP x2 ---
Matriarch x1 ---
Patriarch x1 ---
Quarter FP x1.5 x1.1
Scrake x3 x3
Siren x3 x3
Slasher x3 x4.5
Stalker x3 x2.5

Poundemonium

Killing Floor 2 horzine weekly outbreak
Poundemonium
All Fleshpounds, all the time. Almost.
The Fleshpound Convention is in town!
Start Date
End Date
Killing Floor 2 Weekly Outbreaks - Poundemonium
Outbreak Completion Reward
Weekly | King Pound Visor | Precious
Related Achievements

All Fleshpounds, all the time. Almost.

Gameplay specifics:

  • Boss replacement: Fight against King Fleshpound. King Fleshpound is capable of performing special "Whirlwind", "Ground Pound Explosion" and "Chest Beam" attacks. When King Fleshpound changes its battle phase it spawns a set of mini Fleshpounds (Quarter Pounds). Quarter Pounds also have a chance to replace common ZEDs.
  • Difficulty - Suicidal, Waves - 7.
  • Each time King Fleshpound changes its battle phase (including phase 0, when it appears on the map) it spawns a set of Quarter Pounds, which are the smaller versions of the normal Fleshpound. Quarter Pounds have less health and are slightly more vulnerable against various damage types than normal Fleshpounds. The amount Quarter Pounds spawned depends on the number of players on the server (1-6).
  • ZED to be replaced by Quarter Pound - Odds: AlphaClot - 5%, Slasher - 10%, GoreFast - 10%, Crawler - 5%, Stalker - 5%, Bloat - 65%.
  • Scrake has 90% chance to be replaced by Fleshpound (normal variant).
  • Each wave contains only 55% of the base wave AI amount.
  • King Fleshpound always spawns enraged.


Up, Up, and Decay

Killing Floor 2 horzine weekly outbreak
Up, Up, and Decay
Try to make ninety-nine Zed balloons.
Shooting Zeds in this outbreak will cause them to inflate like balloons, even to the point of floating away and popping!
Start Date
End Date
Killing Floor 2 Weekly Outbreaks - Up, Up and Decay
Outbreak Completion Reward
Weekly | Hans Plushy Backpack
Related Achievements

Try to make ninety-nine Zed balloons.

Gameplay specifics:

  • ZEDs regenerate HP: ZEDs enlarge upon taking damage and at the same time constantly regenerate their health / deflate. Killed ZEDs have custom gravity scale and also explode shortly, acting like balloons.
  • Note: In this mode ZEDs do not die to headshots: regardless of where the shot lands ZED takes health and headhealth damage at the SAME TIME. Damage dealt to headhealth is a % of how much damage ZED took compare to its maximum body health. For example: Slasher (200 health, 50 headhealth) vs. off-perk SCAR-H (55 points of damage):
  1. Slasher gets hit in body once, its health become 145 and its headhealth at the same time become (145 / 200) x 50 = 36.
  2. Slasher gets hit in head once. Since the incoming damage is greater than Slasher's headhealth, the Extra Damage On Decapitation mechanic kicks in (see "ZEDs - Damage to take"). Slasher takes Rounddown (55x1.1) + (Rounddown (55x1.1) + 200 x 0.25) x1.1 = 189 points of damage to its health and is left with (11 / 200) x 50 = 4 points of headhealth.
  • Maximum ZED size scale - x3 (achieved on death), size change interval - x0.1.
  • Custom gravity factor for inflated killed ZEDs = -0.57 (for comparison, the default gravity factor is "1").
  • Explosions are purely visual and do not damage players.
  • Inflation explosion timer - 1.7 seconds.
  • Each wave contains only 70% of the base wave AI amount.
ZEDs have their health and head health adjusted by following multipliers:
ZED: Health scale: Head health scale: Regeneration
Abomination x0.5 --- 1%/s
Alpha x2 x2.5 10%/s
AlphaKing x1 x1.2 10%/s
Bloat x0.4 x1.5 10%/s
Crawler x3 x6 10%/s
CrawlerKing x3 x6 10%/s
Cyst x2 x2.5 10%/s
Fleshpound x0.35 x2 10%/s
Gorefast x1 x3 10%/s
Gorefiend x0.75 x1 10%/s
Hans x1 (shield - x1.25) --- 0.5-1%/s
Husk x1 x1 10%/s
King FP x0.75 --- 1%/s
Matriarch x0.5 --- 1%/s
Patriarch x1.1 --- 1%/s
Quarter FP x0.7 x0.75 10%/s
Scrake x0.5 x1 10%/s
Siren x1 x1 10%/s
Slasher x2 x2.5 10%/s
Stalker x3.5 x5 10%/s
Hans Volter's HP % regeneration rate increases linearly from 0.5% to 1%/s according to the CURRENT PLAYERS / MAX PLAYERS ratio.

Zed Time

Killing Floor 2 horzine weekly outbreak
Zed Time
All the Zed Time in the world.
Ever think that life is passing you by? Not in this outbreak! You'll be in Zed Time any time you're near a Zed.
Start Date
End Date
Killing Floor 2 Weekly Outbreak - ZED Time
Outbreak Completion Reward
Weekly | Fleshpound Visor
Related Achievements

All the Zed Time in the world.

Gameplay specifics:

  • Permanent ZED Time: ZED Time is always ON, players may leave ZED Time into the partial ZED Time when being at the certain distance from ZEDs. ZEDs have increased spawn rate. Lvl 25 perks are OFF.
  • ZED Time slomo scale - x0.5.
  • Distance to ZEDs to enter ZED Time - 14.5 meters.
  • Distance to boss to enter ZED Time - 20.48 meters.
  • Height to enter / leave ZED Time, when within ZEDs vicinity - 5.12 meters.
  • ZEDs spawn much faster (x15 spawn rate multiplier). Spawn points have no de-rate time (are always "good" to spawn).
  • Stalker has a 7% chance to be replaced by Scrake. No such replacement allowed during the boss wave.
  • ZED Time ends when 6 or fewer ZEDs remain
  • Each wave contains only 50% of the base wave AI amount.
  • Level 25 skills are inactive in this mode.
ZEDs have their health and damage adjusted by folling multipliers:
ZED: Health scale: Damage scale:
Abomination x0.8 x0.85
Alpha --- x0.6
AlphaKing --- x0.6
Bloat --- x0.6
Crawler --- x0.6
CrawlerKing --- x0.6
Cyst --- x0.6
FP / QP --- x0.6
Gorefast --- x0.6
Gorefiend --- x0.6
Hans x0.7 x0.7
Husk --- x0.6
King FP x0.8 x0.85
Matriarch x0.8 x0.85
Patriarch x0.8 x0.85
Scrake --- x0.6
Siren --- x0.6
Slasher --- x0.6
Stalker --- x0.6
Stalker has a 7% chance to be replaced by Scrake. No such replacement allowed during the boss wave.
ZED Time goes off when there is only 6 AIs remain during the wave time.
Each wave contains only 50% of the base wave AI amount.
Level 25 skills are inactive in this mode.

Beefcake

Killing Floor 2 horzine weekly outbreak
Beefcake
Bigger they are, harder you fall.
In this outbreak, Zeds increase their health, size, and reach when they hit players or are affected by certain Zed abilities.
Start Date
End Date
Killing Floor 2 Weekly Outbreak - Beefcake
Outbreak Completion Reward
Weekly | Horzine Armor | Precious
Related Achievements

Bigger they are, harder you fall.

Gameplay specifics:

  • ZEDs get stronger: Each time ZED deals damage to aplayer, is rally boosted, is within the AOE of Siren's scream attack or takes poison damage left by killed Elite Crawlers, it's health and size are increased by the listed value.
  • Difficulty - Suicidal, Waves - 7.
  • Stats increment happens for every ZED individually.
  • Health increment affects both - ZED's max health and ZED's current health. Maximum health increased according to the listed %, if by the moment of health growth the ZED is missing some HP, its current HP value will be increased by (DEFAULT HP x % INCREMENT) amount of the points, but will never be more than its new max health value. In other words ZED will be healed by the given %.
  • Unlike body, ZED's head does not scale up. Its HP and size remain the same.
  • Each wave contains only 75% of the base wave AI amount.
ZED / Action Body size increment, when ZED is under effect of: Max increment
Does damage Rally boosted Siren scream Poison cloud
Abomination 1% 1% 1% 1% x1.25
Alpha 5% 5% 2% 2% x1.5
AlphaKing 5% 5% 2% 2% x1.5
Bloat 5% 10% 2% 2% x1.25
Crawler 10% 5% 2% 2% x1.5
CrawlerKing 1% 5% 2% 2% x1.5
Cyst 5% 5% 2% 2% x1.5
DAR Blaster 5% 10% 2% 2% x1.25
DAR Bomber 5% 10% 2% 2% x1.25
DAR Trapper 5% 10% 2% 2% x1.25
Fleshpound 5% 20% 2% 2% x1.25
Gorefast 5% 5% 2% 2% x1.5
Gorefiend 5% 5% 2% 2% x1.5
Hans 1% 1% 1% 1% x1.25
Husk 5% 10% 2% 2% x1.25
King FP 1% 1% 1% 1% x1.25
Matriarch 1% 1% 1% 1% x1.25
Patriarch 1% 1% 1% 1% x1.25
Quarter FP 5% 20% 2% 2% x1.25
Scrake 5% 20% 2% 2% x1.25
Siren 5% 5% 2% 2% x1.5
Slasher 5% 5% 2% 2% x1.5
Stalker 5% 5% 2% 2% x1.5
ZED / Action Health increment, when ZED is under effect of: Max increment
Does damage Rally boosted Siren scream Poison cloud
Abomination 0% 0% 0% 0% x1
Alpha 90% 50% 50% 50% x4.5
AlphaKing 90% 50% 50% 50% x4.5
Bloat 20% 20% 20% 20% x3
Crawler 90% 50% 50% 50% x3.5
CrawlerKing 90% 50% 50% 50% x4.5
Cyst 90% 50% 50% 50% x4.5
DAR Blaster 20% 20% 20% 20% x2
DAR Bomber 20% 20% 20% 20% x2
DAR Trapper 20% 20% 20% 20% x2
Fleshpound 0% 0% 0% 0% x1
Gorefast 90% 50% 50% 50% x3
Gorefiend 20% 20% 20% 20% x2
Hans 0% 0% 0% 0% x1
Husk 20% 20% 20% 20% x2.5
King FP 0% 0% 0% 0% x1
Matriarch 0% 0% 0% 0% x1
Patriarch 0% 0% 0% 0% x1
Quarter FP 0% 0% 0% 0% x1
Scrake 0% 0% 0% 0% x1
Siren 50% 50% 50% 50% x3
Slasher 90% 50% 50% 50% x4.5
Stalker 90% 50% 50% 50% x3

Blood Thirst

Killing Floor 2 horzine weekly outbreak
Blood Thirst
Keep the kill streak going or die...
A thirst of Zed blood will continuously harm you (while the weekly icon is displayed near the health counter). Killing is the only way to regenerate your health.
Start Date
End Date
[[File:|94px|link=]] [ ']
Outbreak Completion Reward
Bloodthirst Backpack
Related Achievements

Keep the kill streak going or die...

Gameplay specifics:

  • Health drain: A health drain debuff constantly harms all players during the waves, unless there are less than 5 ZEDs alive. Killing enemies or making assists regenerates a portion of the player’s health. Other healing methods are deactivated. Killing Scrakes and Fleshpounds grants "Hellish Rage" PowerUp (without the health cost upon activation).
  • Difficulty - Suicidal, Waves - 7.
  • Players constantly lose health: 6 hp every 2 seconds. Delay to apply damage - 10s after wave begin. Damage type to take is "falling". Perk's damage resistance mitigates portion of this damage. Damage goes to actual health and is not stopped by armor.
  • Health does not drop during trader time. Players are completely healed at the start of trader time. Health does not drop during the boss wave.
  • ZEDs spawn much faster: spawn rate multiplier = x6.
ZED HP on kill HP on assist Ground speed Health scale Damage dealt by
Alpha 5 3 x1.2 --- ---
AlphaKing 10 7 x1.2 --- ---
Bloat 16 11 x1.2 --- ---
Crawler 5 3 x1.2 --- ---
CrawlerKing 10 7 x1.2 --- ---
Cyst 5 3 x1.2 --- ---
DAR Blaster 10 7 x1.2 --- ---
DAR Bomber 10 7 x1.2 --- ---
DAR Trapper 10 7 x1.2 --- ---
Fleshpound 60 42 x1.2 --- ---
Gorefast 7 5 x1.2 --- ---
Gorefiend 10 7 x1.2 --- ---
Husk 12 8 x1.2 --- ---
Quarter FP 36 25 x1.2 --- ---
Scrake 50 35 x1.2 --- ---
Siren 12 8 x1.2 --- ---
Slasher 5 3 x1.2 --- ---
Stalker 7 5 x1.2 --- ---
Abomination --- --- --- x1 x0.75
Hans --- --- --- x1 x0.75
King FP --- --- --- x1 x0.75
Matriarch --- --- --- x1 x0.75
Patriarch --- --- --- x1 x0.75
PoopSpawn 7 5 --- --- ---

Coliseum

Killing Floor 2 horzine weekly outbreak
Coliseum
Only berserkers allowed!
Sharp your swords and axes and welcome to the arena! Train your Battering Rams skills.
Start Date
End Date
[[File:|94px|link=]] [ ']
Outbreak Completion Reward
Zweihander | Coliseum | Precious
Related Achievements

Only berserkers allowed!

Gameplay specifics:

  • Melee mode: Only Berserkers using melee weapons allowed. ZED Time rate increased and Battering Ram skill granted to every player. Custom ZED spawn composition, with more Gorefasts and Quarterpounds than usual.
  • Both of the Berserker's level 25 skills are disabled, replaced instead by SWAT's Battering Ram skill. Kills made via Battering Ram do not trigger the Vampire skill, nor does Battering Ram damage gets boosted by any other Berserker skills.
  • Difficulty - HOE, Waves - 7.
  • Per-wave AI count (of base scale): 0.75, 0.7, 0.65, 0.6, 0.55, 0.5. Dosh on kill (global modifier) - x0.7.
  • ZEDs spawn faster: x2 spawn rate modifier.
  • ZED Time chance on near kill (3 meters or closer) = 60%.
ZED Chance to be replaced by Replace chance Health scale Damage dealt by
Abomination --- --- x0.75 x0.6
Alpha Gorefast 10% x1 x0.75
AlphaKing --- --- x1 x0.75
Bloat Quarter FP 50% x1 x0.75
Crawler Gorefast 10% --- ---
Cyst --- --- x1 x0.75
Fleshpound --- --- x0.75 x0.6
Gorefast Gorefiend 30% x1 x0.75
Gorefiend --- --- x1 x0.75
Hans --- --- x0.75 x0.6
Husk Scrake 100% --- ---
King FP --- --- x0.75 x0.6
Matriarch --- --- x0.75 x0.6
Patriarch --- --- x0.75 x0.6
Quarter FP --- --- x0.75 x0.6
Scrake Fleshpound 50% x0.75 x0.6
Siren Quarter FP 50% x1 x0.75
Slasher Gorefast 10% x1 x0.75
Stalker Gorefast 10% --- ---