Poison

This page contains content from Underrail: Expedition expansion.

Poisoning is caused by the attacks of poisonous creatures and man-made poisonous weaponry such as throwing knives, crossbow bolts, caltrops and bear traps. Version 1.1.5.0 also introduced ability to coat bladed melee weapons with poison.

Mechanics

If the attack (usually Mechanical attack) delivering poison does not penetrate armor (deals no damage), no poison will be applied. But once a poison is delivered inside an organic target, it bypasses the Bio resistance and threshold of worn armor, but not the target's innate bio damage modifier.

Irongut pills and other sources of untyped or biological damage reduction will reduce damage of poisons. Up to 3 stacks of any poison can be removed with a single dose of Antidote. It removes poisons in random order.

When a new stack of poison is applied, the duration of all stacks is refreshed. The Hypertoxicity feat doubles the damage done by poisons you apply.

Overview of poisons

Name	Crafting source	Availability				Max. Stacks	Duration	Effect	End effect
		Bear Trap	Chemical Bolt	Throwing Knife	Caltrops
Black Dragon Poison	Black Dragon fish	☑	☑	☑	☒	1	1 turn	Psi inhibition	None
Burrower Poison	Burrower Poison Gland	☑	☑	☑	☑	5	5 turns or less	Deal 7 Bio damage	None
Cave Ear Poison	Cave Ear mushroom	☑	☑	☑	☑	1	3 turns or less	+50% Bio damage taken, -5 Perception	None
Crawler Poison	Crawler Stinger	☑	☑	☑	☑	1	2 turns	Deal 5 Bio damage, potentially Hyperallergenic	Stun
Spirit Poison	Spirit Mushroom	☑	☑	☑	☒	1	2 turns	Deal 15 Bio damage, -65% Resolve	Summon Doppelganger
Blinding Poison E	Giant Creeper Poison Gland E	☑	☑	☑	☑	8	3 turns	Deal 7 Bio damage, -1 Perception	None
Leper Poison E	Leper Serpent Poison Gland E	☑	☑	☑	☒	6	3 turns	Deal 8 Bio damage, +10% Mechanical damage taken	None
Heartbreak Poison E	Heartbreaker Serpent Poison Gland E	☑	☑	☑	☒	5	5 turns	Deal 3 Bio damage	Cardiac arrest

Black Dragon Poison

	Poison (Black Dragon)
Affected by poison which prevents psi ability invocation and psi point regeneration.
Duration: 1 turn

Black Dragon Poison can be extracted from Black Dragons with Blueprint: Extract Humour.

It acts as a psi inhibitor, preventing the use of psi abilities and halting psi regeneration.

Sources

• Black Dragon Poison Bear Trap
• Black Dragon Poison Bolt
• Black Dragon Poison Throwing Knife
• Faceless Gaunt attacks

Burrower Poison

	Poison (Burrower)
This character is afflicted by burrower poison, suffering 7 bio damage every turn.
Duration: up to 5 turns
Max stacks: 5

Burrower Poison can be extracted from Burrower Poison Glands with Blueprint: Extract Humour.

Burrower poison can stack multiple times, potentially leading to large amounts of unmitigable bio damage per turn, even on otherwise heavily armored targets. Damage varies depending on source.

Sources

• Burrower spine attack
• Burrower Poison Bear Trap
• Burrower Poison Bolt
• Burrower Poison Caltrops
• Burrower Poison Throwing Knife
• Faceless Gaunt attacks

Cave Ear Poison

	Poison (Cave Ear)
This character is afflicted by cave ear poison. All biological damage received increased by 50% and perception reduced by 5.
Duration: up to 5 turns

Cave Ear Poison can be processed from Cave Ear mushrooms with Blueprint: Process Plant or Fungus.

It increases damage other poisons do by 50% and the perception loss can cause up to 33% reduction in ranged skill.

Sources

• Cave Ear Poison Bear Trap
• Cave Ear Poison Bolt
• Cave Ear Poison Caltrops
• Cave Ear Poison Throwing Knife
• Faceless Gaunt attacks

Crawler Poison

	Poison (Crawler)
This character is afflicted by crawler poison that deals 5 damage each turn for 2 turns. If the poison is not removed before it expires it will stun the victim for 2 turns.
Duration: 2 turns

Crawler Poison can be extracted from Crawler Stingers with Blueprint: Extract Humour.

Crawler poison acts as a delayed 2-turn Stun if its victim cannot remove it with Antidotes.

Sources

• Crawler sting attack
• Crawler Poison Bear Trap
• Crawler Poison Bolt
• Crawler Poison Caltrops
• Crawler Poison Throwing Knife
• Faceless Gaunt attacks

Spirit Poison

	Poison (Spirit)
This character if afflicted by spirit poison, suffering 15 bio damage every turn and having its resolve reduced by 65%. If the poison is not removed before it expires it will summon a psionic doppelganger of the victim if it's human.
Duration: 2 turns

Spirit Poison can be processed from Spirit Mushrooms with Blueprint: Process Plant or Fungus.

It deals bio damage, reduces resolve and summons a doppelganger if its human victim cannot remove it with Antidotes.

Sources

• Spirit Poison Bear Trap
• Spirit Poison Bolt
• Spirit Poison Throwing Knife
• Faceless Gaunt attacks

Blinding Poison (Expedition)

	Poison (Blinding)
This character is afflicted by blinding poison, suffering 7 bio damage every turn. Their perception is also decreased by 1.
Duration: 3 turns
Max stacks: 8

Blinding Poison can be extracted from Giant Creeper Poison Glands with Blueprint: Extract Humour.

Blinding poison deals the same amount of damage as burrower poison, but does not last as long. However, it also reduces perception and can stack up to 8 times.

Sources

• Giant Creeper attacks
• Blinding Poison Bear Trap
• Blinding Poison Bolt
• Blinding Poison Caltrops
• Blinding Poison Throwing Knife

Leper Poison (Expedition)

	Poison (Leper)
This character is afflicted by leper poison, suffering 8 bio damage every turn and receiving 10% more mechanical damage from all sources.
Duration: 3 turns
Max stacks: 6

Leper Poison can be extracted from Leper Serpent Poison Glands with Blueprint: Extract Humour.

Leper poison deals bio damage and potentially increases the target mechanical damage modifier taken by up to 60%.

Sources

• Leper Serpent attacks
• Leper Poison Bear Trap
• Leper Poison Bolt
• Leper Poison Throwing Knife

Heartbreak Poison (Expedition)

	Poison (Heartbreak)
This character is afflicted by heartbreak poison, suffering 3 bio damage every turn. It the poison is not removed, it will deal additional 30 bio damage on expiration.
Duration: 5 turns
Max stacks: 5

Heartbreak Poison can be extracted from Heartbreaker Serpent Poison Glands with Blueprint: Extract Humour.

Heartbreak poison deals relatively weak bio damage, but causes a cardiac arrest when it ends. The damage of cardiac arrest quickly increases with stacks of heartbreak poison (15, 45, 90, 150, 225). New stacks reset the duration.

Sources

• Heartbreaker attacks
• Heartbreak Poison Bear Trap
• Heartbreak Poison Bolt
• Heartbreak Poison Throwing Knife