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{{DisambigMsg|objects designed to hinder players|deployable skills|Deployable traps}}
'''Hazards''' are substances, traps, or phenomena placed throughout biomes that can either inflict direct damage to the player through contact, or pose some other danger to the player, such as [[Mechanics#Falling|falling]].
The damage that hazards can deal is capped at 30% of the player's HP per hit.

While there are some forms of environmental hazards common to all [[Biomes|biomes]], most hazards are considered to be biome-specific.

== Natural hazards ==
'''Natural hazards''' are native to the biomes they are found in and enemies found in those biomes will sometimes be fully adapted to such hazards.

=== Pits ===
'''Pits''', also referred to as the abyss, are a natural hazard within the [[Ramparts]], [[Clock Tower]], [[Cavern]],{{DLC|RotG}} [[Astrolab]],{{DLC|RotG}} [[Fractured Shrines]],{{DLC|FF}} [[Undying Shores]]{{DLC|FF}} and [[Mausoleum]].{{DLC|FF}} These are basically just the bottomless pits found throughout those biomes. Falling into a pit will damage and teleport the player to the last platform they were on.
* See also the [[Mechanics]] entry for [[Mechanics#Falling|falling]] to understand the damage behavior associated with falling into pits.

=== Toxic pools ===
'''Toxic pools''', also referred to as poisonous puddles, are natural hazards found in the [[Toxic Sewers]] and [[Ancient Sewers]]. They only damage the player and inflict mild [[Status effects#Poison|poison]] damage during contact with the poisonous waters. The poisonous water appears green in the Toxic Sewers and brownish or light yellow in the Ancient Sewers.
* See also the [[Mechanics]] entry for [[Mechanics#Poisonous puddles|poisonous puddles]] for a better understanding of its damage behavior.
* The poison damage can be averted if the player isn't considered to be in the toxic pool. The animation should look like the player jumping on the surface of the water itself. The player otherwise incurs poison damage if the legs become submerged.
* Poison damage from poisonous water can be nullified by the Poison Immunity [[Modifiers|modifier]] found in some [[Gear#Amulets|amulets]].
* Poisonous water also interacts like normal [[Mechanics#Liquid_interactions|liquids]]. It cannot be burned, except with the help of oil, and it can conduct electricity, among other things.

=== Darkness ===
The '''Darkness''' is only found in the [[Forgotten Sepulcher]], or in all biomes if the [[Custom Mode]] modifier "Follow the Light" is active. It functions as a sort of active timer on the player, hindering sight and soon dealing damage over time. Killing enemies and stepping in the light of lanterns will renew the timer, giving more time before the Darkness will start to damage. The damage received will not cause the player to die instantly while [[File:Cursed Effect.png|frameless|link=]] [[Curse|cursed]] or while holding the {{Item|Cursed Sword}}. Like toxic pools, Darkness does not affect enemies.
* See also:
** The [[Mechanics]] entry for the [[Mechanics#The Darkness|Darkness]] to understand its damage behavior.
** [[Forgotten Sepulcher#The Darkness|Forgotten Sepulcher]], for more information.

=== Lava pools ===
'''Lava pools''' are natural hazards found in the [[Prisoners' Quarters]] (inside the room with the {{Pickup|cavern key}}), in the [[Graveyard]] near the Cavern entrance, the [[Cavern]],{{DLC|RotG}} [[Guardian's Haven]],{{DLC|RotG}} and the [[Astrolab]].{{DLC|RotG}} Damage inflicted by the lava is considered trap damage and scale according to enemy tier, thus, lava deals moderate damage while in the Prisoner's Quarters and massive damage while in the caverns.
* Lava instantly kills enemies and familiars coming into contact with it.
* The player is teleported to the last platform they were on if they fall, similarly to pits.

=== Carnivorous plants ===
The '''carnivorous plants''' leaves their mouths wide open and suddenly bites upwards shortly after being stepped on. When closed, the player can bounce on the plant to reach higher areas. They are found in the [[Prisoners' Quarters]] and in the [[Dilapidated Arboretum]].{{DLC|TBS}}

== Traps ==
'''Traps''' inflict damage to the player either through close-contact damage or through projectile damage. Aside from a few traps, like spiked flails, almost all traps are able to inflict damage to both the player and the enemy.

Mechanics:
* Trap damage depends on the difficulty of the zone where the traps are found and scale with enemy tier.
* The damage is capped at 30% of the player's HP per hit.

=== Spikes ===
'''Spikes''' are the most common hazard typically found across all biomes. They are static, damaging anything that comes into contact with them. They can be found on ceilings, floors, and walls. The thorns found within the [[Dilapidated Arboretum]]{{DLC|TBS}} are functionally identical to normal spikes.

=== Retracting spikes ===
'''Retracting spikes''' are only found inside of [[Challenge Rifts]] and boss rooms (e.g. [[Insufferable Crypt]]). They can retract and will not deal damage during their retracted state. They will either cycle between being retracted and expanded on a short timer, or will shoot out shortly after being stepped on or touched by the player.
* Pressure-triggered spikes shine briefly, as if to explode, before the spikes shoot out.

=== Spiked flails ===
'''Spiked flails''' are traps that will damage anything that comes into contact with the spiked ball and are the second most common form of trap found across all biomes. The spiked ball is anchored, via a chain, to a fixed point in the floor, wall, or ceiling, and they continuously rotate around that anchor point at a singular fixed direction, either clockwise or counterclockwise, and at a fixed rate. When the player is hit, it will periodically be unable to strike the player again to prevent multiple hits at once. They can be parried with a shield which will cause the flail to pass through the player.
* The spiked ball can be parried and dodge-rolled.
* The player can usually duck under spiked balls anchored to the floor.

=== Sawblade launchers ===
'''Sawblade launchers''' are found in the [[Slumbering Sanctuary]], [[Fractured Shrines]],{{DLC|ff}} in secret areas, and in [[Challenge Rifts]], and periodically launch sawblades that deal damage to the player. They can be found attached on floors, walls, or ceilings.
* The sawblades can be parried so long as the projectiles run parallel to the player (i.e. sawblades shooting up or down cannot be parried).

=== Spinning axe traps ===
'''Spinning axe traps''' are found in the [[Fractured Shrines]].{{DLC|FF}} They are long poles spinning on a central axis with an axe on both ends.

=== Log traps ===
'''Log traps''' are found in the [[Fractured Shrines]].{{DLC|FF}} A log hanging from a chain, hidden in the ceiling. Stepping on a nearby switch releases the log, making it swing and hit the player dealing damage and pushing them back a fair distance. Enemies can’t activate the switch, but they ''can'' get hit by the log.

=== Exploding barrels ===
'''Exploding barrels''' are orange, bouncy, explosive barrels that can be found in the [[Derelict Distillery]]. They can be found laying on the ground, placed, thrown by [[Infected Worker|Infected Workers]], or fired from dispensers. The barrels explode on contact with the player, spikes, or other barrels, but will bounce off of walls and floors. They can be deflected by the player's attacks and will then change to a white color and damage enemies instead. Orange barrels hurt the player, white barrels hurt enemies.

Barrels can be grabbed and moved by the player using the {{Rune|hom|1}}. The barrel becomes primed to attack enemies instead of the player, and can be used to damage them on contact.

Stationary barrels do not explode on contact, but when they are struck they will behave like other barrels that have been deflected by the player.

=== Cavern lanterns ===
'''Cavern lanterns''' are static traps that will glow and create a red aura whenever the player enters the blast radius mid-air. If an enemy or player enters that radius, it will charge while dragging in anything that is in the radius, exploding shortly afterwards. They recharge over time.
* '''Cavern lanterns''' are native to the [[Cavern]]{{DLC|rotg}} and in the [[Astrolab]].{{DLC|RotG}}
* The suction effect can be quickly escaped by dodge-rolling.

=== Crystal Collapse ===
'''Crystal Collapse''' is an attack from the [[The Giant|Giant]]{{DLC|rotg}} that's only used in his 3rd phase. After slamming his fists on the ground, multiple crystals will start falling from the ceiling for an extended period of time.
* The crystals can be dodge rolled or blocked, but not {{color|parried}}.

=== Electric waves ===
'''Electric waves''' are exclusive to the [[Cavern]]{{DLC|RotG}} and the [[Astrolab]].{{DLC|RotG}} They work similarly to lava pools, if a player comes into contact with one, they take damage and teleport to the last platform they were on.
* The waves are only ever spread horizontally.

=== Magic shooters ===
'''Magic shooters''' are found exclusively in the [[Astrolab]].{{DLC|RotG}} They fire 3 quick, purple magic projectiles at once which all deal individual damage to the player, so they can be dangerous if all projectiles connect. The projectiles can be parried, though it's not recommended unless parries are chained to block all 3 of them.

=== Barrel dispensers ===
'''Barrel dispensers''' are found in the [[Derelict Distillery]]. They fire exploding barrels that can bounce on the ground. They use a yellow indicator, normally used by enemies, that warns that they are about to launch a barrel.

== Hazard-prone mechanisms ==
Some [[Objects#Mechanisms|mechanisms]] can accidentally inflict damage to the player or pose some other hazard.

=== Crumbling platforms ===
'''Crumbling platforms''' are found in the [[Fractured Shrines]].{{DLC|FF}} Thin platforms are made out of single tile-wide sections which break down shortly after touching them. Once broken, they will not regenerate.

=== Elevators ===
* '''Elevator''' platforms can deal trap damage to the player if the platform lands on top of them.
* Similarly, trap damage is also dealt if the player gets caught between the platform and the ceiling while the platform is ascending.
* See also the mechanism entry for [[Objects#Elevators|'''Elevators''']].

=== Mechanized platforms ===
* '''Mechanized platforms''' essentially function as trapdoors, dropping for a few seconds when the player touches them after a slight delay.
* The floating ice platforms in the [[Throne Room]] are functionally identical to '''mechanized platforms'''.
* See also the mechanism entry for [[Objects#Mechanized_platforms_2|'''Mechanized platforms''']].

=== Dirt platforms ===
'''Dirt platforms''' are found in the [[Infested Shipwreck]].{{DLC|TQatS}} They function as normal platforms but can be destroyed when struck by [[Mutineer]]s,{{DLC|TQatS}} [[Armored Shrimp]],{{DLC|TQatS}} or explosions from other enemies, such as [[Kamikaze]]s. Dirt Platforms do not regenerate once destroyed.
== Other hazards ==
* Fake [[Objects#Treasure_chests|treasure chests]] technically fall within the definition of a trap but do not cause any trap damage.
* Some areas also virtually function as traps through their devious level designs:
** A secret area in the [[Ancient Sewers]] is designed to make the player fall from high above the ceiling into a toxic pool. The poison damage can only be averted by using the Poison Immunity modifier or by using more than two jumps to reach a safe platform.
** Some [[Challenge Rifts]] rifts employ spikes that span the maximum double-jump distance. To sufficiently increase jump distance with only two jumps, the traps require a double-jump to be performed after running/rolling off the edge such that the first jump is initiated above the spikes.
*** Climbing onto a platform allows the player to dodge and pass through spikes. This sometimes makes dodge rolling after a double jump an equally viable alternative to increasing overall jump distance.
*** Climbing walls with the {{Rune|Spider|1}} can sometimes sufficiently provide enough vertical clearance to horizontally fall and clear traps. A singular wall can be repeatedly scaled just by adding a slight delay before the second jump.
** Some [[Challenge Rifts]] employ retracting spikes that cover more than the maximum double-jump distance. To safely reach the other side, the traps require a perfectly timed double-jump to sufficiently increase airtime and to avoid landing on expanded spikes.
** In the [[Cavern]],{{DLC|rotg}} right before the exit to the [[Guardian's Haven]],{{DLC|rotg}} it is possible to get stuck on a platform beneath the adjoining bridge. The only way back up is to jump to the wall on the other side and climb up using the {{Rune|Spider|1}}.

== Hazard-related achievements ==
* Some [[achievements]] are related to hazards and can be unlocked by:
** Performing a dive attack into spikes.
** Killing an enemy using an elevator.
** Getting killed by an elevator.

== History ==
{{History
|collapsed = yes
|0.2: Introduced the Darkness.
|1.2: [[Rise of the Giant DLC]]{{DLC|RotG}}:
* Introduced lava pools.
* Introduced cavern lanterns.
* Introduced electric waves.
* Introduced magic shooters.
|1.7: Introduced carnivorous plants.
|1.8: There is now a yellow indicator warning before a carnivorous plant bites.
|1.9: Trap damage is now capped at 30% of the player's max health, or 10% of their max health with the {{Mutation|Masochist}} mutation.
|2.0: [[Barrels o' Fun Update]]:
* Introduced barrel dispensers.
* Introduced exploding barrels.
|2.1: Sawblades can now be dodge-rolled.
|2.2: [[Fatal Falls DLC]]{{DLC|FF}}:
* Introduced spinning axe traps.
* Introduced log traps.
* Introduced crumbling tiles.
}}

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