Chaos Trials

TimeMasterTimeMaster Member, Early Access
edited March 26 in Community Guides
Chaos Trials-Headerpng

Chaos Trials

Chaos Trials bring the chaos and dynamic play of Sabotage mode and the problem-solving of Weekly Challenges to Survival gameplay. Available to teams of 1-3 players and custom games, Chaos Trials offer lucrative rewards for conquering a series of increasingly difficult challenges. Though each trial begins simply they increase in complexity and difficulty with every victory. Put yourself to the ultimate orc-slaying test!

Chaos Trials are accessed with Chaos Keys that are occasionally discovered while playing matches in all other game modes, or earned as a Daily Login Reward. Each key has an associated challenge level from Apprentice through Rift Lord, and players only encounter keys of the challenge level that matches their current progression.

Chaos Trials are designed to build upon basic Orcs Must Die! gameplay, skills, and strategy to challenge experienced War Mages. Chaos Trials are also designed to scratch the itch of classic Nightmare mode gameplay by providing extremely difficult content for the most skilled players. 

Chaos Keys

Each Chaos Key begins at tier 1 with a basic set of random modifiers and randomly selected map. This forms the basis of the first tier challenge for this Chaos Key. Successful completion of a tier upgrades the Chaos Key, registers the Score on the leaderboard if it is a player’s highest Score, awards a chest to each participating player, reselects an eligible Map, and adds additional modifiers to those already in play. 

Each tier victory further upgrades the Chaos Key and brings another Chest, another new map, new modifiers, and a higher cumulative Score. Total Score of the Chaos Key is the sum of the Score achieved at each Map, which are calculated just like in the Survival version of them. Maps will not repeat until each eligible Map has been played once.

Chaos Trials also feature a leaderboard to track high Scores, allowing players to compare their performance to other War Mages. Leaderboard Scores for this mode are cumulative for each individual Chaos Key and players can have one top score registered next to the tier achieved of the key.

Each challenge defeat consumes one of the Chaos Key’s 3 lives, but does not change the Map or conditions. No Chest is awarded for defeat, and instead the remaining lives and current score are displayed. The Chaos Trial will end if 3 losses are registered. Each Chaos Trial offers a maximum of 12 unique tiers and will also end if all 12 are all successfully finished.

Chaos Keys can also be bought at Tier 1 in the Store and in the Premium Shoppe for the following prices:

  • Apprentice Chaos Key: 225Currency Goldpng or 1500Currency Gibspng
  • War Mage Chaos Key: 375Currency Goldpng or 2500Currency Gibspng
  • Master Chaos Key: 525Currency Goldpng or 4000Currency Gibspng
  • Rift Lord Chaos Key: 675Currency Goldpng or 5000Currency Gibspng

Upon buying a Chaos key of any difficulty, it will show the initial map and modifiers and you will be allowed to re-roll up to 2 times the key completely by paying 50% of its cost on the first roll and 75% for the second one.

List of Chaos Trials Modifiers

ModifierPreviewDescriptionIncompatible ModifiersExcluded Difficulties
Additional Armored Ogres (Modifier)Additional Armored Ogres Modifier iconpng Adds Armored Ogres to waves.
Additional Cyclops Shamans (Modifier)Additional Cyclops Shamans Modifier iconpng Adds Cyclops Shamans to waves.
Additional Fire Fiend Runners (Modifier)Additional Fire Fiend Runners Modifier iconpng Adds Fire Fiend Imps to waves.
Additional Fire Ogres (Modifier)Additional Fire Ogres Modifier iconpng Adds Fire Ogres to waves.
Additional Forest Giants (Modifier)Additional Forest Giants Modifier iconpng Adds Forest Giants to waves.
Additional Gnoll Grenadiers (Modifier)Additional Gnoll Grenadiers Modifier iconpng Adds Gnoll Grenadiers to waves.
Additional Kamikaze Kobolds (Modifier)Additional Kamikaze Kobolds Modifier iconpng Adds Kamikaze Kobolds to waves.
Additional Mercenaries (Modifier)Additional Mercenaries Modifier iconpng Adds Mercenaries to waves.
Additional Mountain Trolls (Modifier)Additional Mountain Trolls Modifier iconpng Adds Mountain Trolls to waves.
Additional Northmun Archers (Modifier)Additional Northmun Archers Modifier iconpng Adds Northmun Archers to waves.
Additional Order Mages (Modifier)Additional Order Mages Modifier iconpng Adds Order Mages to waves.Apprentice
War Mage
Additional Pride Hunters (Modifier)Additional Pride Hunters Modifier iconpng Adds Pride Hunters to waves.
Additional Shield Trolls (Modifier)Additional Shield Trolls Modifier iconpng Adds Shield Trolls to waves.
Additional TNT Archers (Modifier)Additional TNT Archers Modifier iconpng Adds TNT Archers to waves.Apprentice
War Mage
Additional Terracotta Giants (Modifier)Additional Terracotta Giants Modifier iconpng Adds Terracotta Giants to waves.
Additional Unstable Rifts (Modifier)Additional Unstable Rifts Modifier iconpng Adds Unstable Rifts to waves.
Arcane Armor (Modifier)Arcane Armor Modifier iconpng Grants Enemies +50 Arcane Armor.
Bargain Barricades (Modifier)Bargain Barricades Modifier iconpng Decreases the cost of Barricades by 50%.Expensive Barricades (Modifier)
Bargain Buffs (Modifier)Bargain Buffs Modifier iconpng Decreases the cost of buff, restoration, and coin generating Traps by 75%.
Bonus Damage at Low Health (Modifier)Bonus Damage at Low Health Modifier iconpng Heroes deal +25% damage when below 50% health.
Bonus Rift Points (Modifier)Bonus Rift Points Modifier iconpng Doubles Rift Points.Five Rift Points (Modifier)
Camera Freeze (Modifier)Camera Freeze Modifier iconpng Disables Heroes' cameras when their health falls below 50%.
Celebratory Dance (Modifier)Celebratory Dance Modifier iconpng Causes team to dance when a Boss or Mercenary is killed.
Coin Drain (Modifier)Coin Drain Modifier iconpng Drains 0.85% of coin from all Heroes every second. Spend your coin quickly!Apprentice
War Mage
Control Resistance (Modifier)Control Resistance Modifier iconpng Increases Minions' ability to resist control effects by 50%.
Expensive Barricades (Modifier)Expensive Barricades Modifier iconpng Increases the cost of Barricades 2.7x.Bargain Barricades (Modifier) and Expensive Floor Traps (Modifier)
Expensive Ceiling Traps (Modifier)Expensive Ceiling Traps Modifier iconpng Increases the cost of ceiling Traps by 2x.
Expensive Floor Traps (Modifier)Expensive Floor Traps Modifier iconpng Increases the cost of floor Traps by 2x.Expensive Barricades (Modifier)
Expensive Hunter Traps (Modifier)Expensive Hunter Traps Modifier iconpng Increases the cost of Big Game Hunting Traps 3x.
Expensive Physics Traps (Modifier)Expensive Physics Traps Modifier iconpng Increases the cost of Physics Traps by 3x.
Expensive Wall Traps (Modifier)Expensive Wall Traps Modifier iconpng Increases the cost of wall Traps by 2x.
Fast Heroes (Modifier)Fast Heroes Modifier iconpng Increases Hero movement speed by 15%.
Fast Minions (Modifier) Fast Minions Modifier iconpng Increases Minion movement speed by 20%.Slow Minions (Modifier)
Fire Armor (Modifier)Fire Armor Modifier iconpng Grants Enemies +50 Fire Armor.
Five Rift Points (Modifier)Five Rift Points Modifier iconpng Decreases Rift Points to 5.Bonus Rift Points (Modifier) and Rift Point Loss on Death (Modifier)
Gear Disabled (Modifier)Gear Disabled Modifier iconpng Disables all Gear.
Guardian Friendly Fire (Modifier)Guardian Friendly Fire Modifier iconpng Guardian spin attack damage nearby players and Barricades.
Health Drain (Modifier)Health Drain Modifier iconpng Continuously drains health from Heroes.Apprentice
War Mage
Ice Armor (Modifier)Ice Armor Modifier iconpng Grants Minions +50 Ice Armor.
Increased Fourth Ability Cooldown (Modifier)Increased Fourth Ability Cooldown Modifier iconpng Increases Heroes' fourth ability cooldown by 100%.Increased Third Ability Cooldown (Modifier) and Increased Secondary Cooldown (Modifier)
Increased Secondary Cooldown (Modifier)Increased Secondary Cooldown Modifier iconpng Increases Heroes' secondary ability cooldown by 100%.Increased Third Ability Cooldown (Modifier) and Increased Fourth Ability Cooldown (Modifier)
Increased Third Ability Cooldown (Modifier)Increased Third Ability Cooldown Modifier iconpng Increases Heroes' third ability cooldown by 100%.Increased Fourth Ability Cooldown (Modifier) and Increased Secondary Cooldown (Modifier)
Lightning Armor (Modifier)Lightning Armor Modifier iconpng Grants Minions +50 Lightning Armor.
Mana Drain (Modifier)Mana Drain Modifier iconpng Continuously drains mana from Heroes.Apprentice
War Mage
Melee Minion Damage (Modifier)Melee Minion Damage Modifier iconpng Increases Minion melee damage by 25%.
Mercenaries Spawn on Death (Modifier)Mercenaries Spawn on Death Modifier iconpng Summons a Mercenary with each Hero death.
Minions Drop Grenades (Modifier)Minions Drop Grenades Modifier iconpng All Minions have a chance to drop grenades upon death.
More Health Drops (Modifier)More Health Drops Modifier iconpng Increases the number of health drops 2x.No Health Drops (Modifier)
More Mana Drops (Modifier)More Mana Drops Modifier iconpng Increases the number of mana drops 2x.No Mana Drops (Modifier)
More Unchained Drops (Modifier)More Unchained Drops Modifier iconpng Increases the number of Unchained drops by 10x.
No Go-breaks (Modifier)No Go-breaks Modifier iconpng Removes go breaks.Apprentice
War Mage
No Health Drops (Modifier)No Health Drops Modifier iconpng No health drops.More Health Drops (Modifier) and Spudging Pickups (Modifier)
No Mana Drops (Modifier)No Mana Drops Modifier iconpng No mana drops.More Mana Drops (Modifier) and Spudging Pickups (Modifier)
No Map in Combat (Modifier)No Map in Combat Modifier iconpng The minimap is hidden for a short period of time after dealing or taking damage.
Periodic Bomb (Modifier)Periodic Bomb Modifier iconpng Periodically casts The Bomb Spell on a random Hero.
Periodic Heal Aura (Modifier)Periodic Heal Aura Modifier iconpng A minion healing aura is periodically attached to random players.
Persistant Rubble (Modifier)Persistant Rubble Modifier iconpng Barricade rubble does not disappear.
Physical Armor (Modifier)Physical Armor Modifier iconpng Grants Minions +50 Physical Armor.
Primary Knockback (Modifier)Primary Knockback Modifier iconpng Causes primary attacks to periodically knock Heroes back for 7 seconds.
Rift Point Loss on Death (Modifier)Rift Point Loss on Death Modifier iconpng Team loses Rift Points when heroes die.Five Rift Points (Modifier)
Rugged Runners (Modifier)Rugged Runners Modifier iconpng Increases runner Minion health 2x.
Rush Timer (Modifier)Rush Timer Modifier iconpng If not killed within 40s, Minions drop aggro and move 30% faster.
Slow Minions (Modifier) Slow Minions Modifier iconpng Slows Minions by 15%.Fast Minions (Modifier)
Spawn Protection (Modifier)Spawn Protection Modifier iconpng Minions take 50% less damage for 20s after spawning.
Spudging Pickups (Modifier)Spudging Pickups Modifier iconpng Obscures a Hero's camera with spudge when picking up a Powerup.No Health Drops (Modifier) and No Mana Drops (Modifier)
Unstable Rift Polymorph (Modifier)Unstable Rift Polymorph Modifier iconpng The entire team is polymorphed if an Unstable Rift is not closed.Apprentice
War Mage


Chaos Trials also offer players a gameplay mode with an endless supply of Chests to continue collecting and upgrading their Loadouts.

Chaos Trials are extremely challenging but also one of the most rewarding game modes in OMD!U. They offer a chest after every victory as well as an increasing number of skulls based on progression through the tiers. 

Chaos Trial Chests

These contain skulls and cards for traps, guardians, gear, and trap parts that will increase the power and variety for each orc-gibbing arsenal. Each Chaos Trials difficulty has a unique chest. For example, war mage Chaos Trials provide war mage Chaos Trials Chests. Each higher difficulty adds new cards, grants more of each card, and contains an additional item. Each higher tier adds more skulls to the reward of the chest.

  • Apprentice Chaos Trials chests provide 25*tier Currency Skullspng and 2 items. 
  • War Mage Chaos Trials chests provide 50*tier Currency Skullspng and 3 items. 
  • Master Chaos Trials chests provide 75*tier Currency Skullspng and 4 items. 
  • Rift Lord Chaos Trials chests provide 100*tier Currency Skullspng and 5 items.

For example: A Tier 8 Master Chaos Trials Chest provides 75*8 = 600 Currency Skullspng and 4 items. 

Chaos Trials Chests are earned by successfully completing tiers of the Chaos Trial Keys, one for each tier of every key.


The total score of a Chaos Trials Key is the sum of the score obtained at each of the Tiers completed of a key.

Visit the Scoring Guide for more info.

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