Debuffs are temporary, negative status effects, as opposed to buffs, which affect the player positively. Once a debuff has been inflicted, the debuff's icon will display to the upper right / upper left of the player's window, along with a icon shading / count-down timer, showing how much longer the debuff will be in effect. The counter will begin at one minute/second less than its listed duration and show zero during the final minute/second.
Players can inflict the following debuffs on most enemies: Confused, Cursed Inferno, Ichor, Betsy's Curse, Midas, Poisoned, Venom, On Fire!, Frostburn, Shadowflame, Oiled, Bleeding, and Stunned. See below for a list of weapons that inflict debuffs on enemies.
In general, damaging debuffs will stack: If a player is both Poisoned and On Fire!, they will take damage from both debuffs. However, Poisoned and Venom do not stack, and Poisoned will take precedence over Venom. Death always cancels any active buffs or debuffs.
Unlike buffs, debuffs cannot be canceled by right-clicking their icons. The Nurse can cancel debuffs at a cost of 750 per active debuff. This does not apply to the Potion Sickness debuff, because when trying to cancel the Potion Sickness debuff, the Nurse will not charge for recovery of the debuff and the debuff will not be canceled, but the Potion Sickness icon will disappear.
Internal Buff ID: 30
|Prevents the player from regenerating life naturally. Since enemies cannot regenerate life naturally, they will lose life instead when they have the debuff.||Cannot regenerate life||3-45 seconds / 6-90 seconds|
Internal Buff ID: 20
|Players turn green, slowly lose life over time, and cannot regenerate life.||Slowly losing life||3-10 seconds / 2-20 seconds|
Internal Buff ID: 24
|Players are engulfed with flames, lose life over time, and cannot regenerate life.||Slowly losing life||7-10 seconds / 14-20 seconds|
Internal Buff ID: 70
|Players turn purple, lose life over time, and cannot regenerate life.||Losing life||8 seconds / 16 seconds|
Internal Buff ID: 22
|Players turn blue, and light brightness is lowered.||Decreased light vision||15 seconds / 5-30 seconds|
Internal Buff ID: 80
|Severely lowers the brightness of light, making it nearly impossible to see.||Light vision severely reduced||3 seconds / 6 seconds|
Internal Buff ID: 35
|Prevents the player from using anything that requires mana.||Cannot use items that require mana||7 seconds / 2.5-14 seconds|
Internal Buff ID: 23
|Prevents the player from using anything.||Cannot use any items||4 seconds / 1.25-8 seconds|
Internal Buff ID: 31
|◀ Left and ▶ Right's effects are switched.||Movement is reversed||7 seconds / 2.5-14 seconds|
Internal Buff ID: 32
|Slows down the player's speed.||Movement speed is reduced||5-16 seconds / 0.5-32 seconds|
Internal Buff ID: 197
|Player speed is severely reduced.||Movement is significantly reduced||14 seconds / 14 seconds|
Internal Buff ID: 33
|Causes the player's physical abilities to decrease. Werewolf buff negates this debuff.||Physical abilities are decreased||1-5 minutes / 18.75 seconds-10 minutes|
Internal Buff ID: 36
|Causes the player's defense to go down to half of its normal defense.||Defense is cut in half||10 seconds-2 minutes / 16.25 seconds-4 minutes|
Internal Buff ID: 195
|Causes the player's defense to go down to half of its normal defense.||Your armor is lowered!||5 seconds / 10 seconds|
Internal Buff ID: 196
|Reduces all player-inflicted damage by 50%.||Your attacks are weaker!||5 seconds|
Internal Buff ID: 37
|Causes the player to die if they escape the Underworld.||You have seen something nasty, there is no escape.||While fighting Wall of Flesh|
Internal Buff ID: 38
|Pulls the player, through tiles, directly in front of the Wall of Flesh.||You are being sucked into the mouth||While in contact with The Tongue|
Internal Buff ID: 39
|Ignites the player with cursed flames that deal damage over time. Cursed flames can not be extinguished by water.||Losing life||7-8 seconds / 14-16 seconds|
Internal Buff ID: 69
|Causes the player to glow yellow along with the loss of 15 / 20 defense.||Reduced defense||15 seconds / 30 seconds|
Internal Buff ID: 44
|Affected players or enemies lose life over time and cannot regenerate life.||It's either really hot or really cold. Either way it REALLY hurts||1-8 seconds|
Internal Buff ID: 46
|Slows down the player's speed.||Your movement speed has been reduced||10-45 seconds / 20 seconds-90 seconds|
Internal Buff ID: 47
|Prevents the player from moving or using anything.||You can't move!||1-1.5 second / 2-3 seconds|
Internal Buff ID: 149
|Causes the player to be stuck in the spot where they were hit. Players are still allowed to use items while this effect is ongoing.||You are stuck||1 seconds|
Internal Buff ID: 156
|Prevents the player from moving horizontally or using anything. The player will take increased fall damage, which will not be negated by Wings or Lucky Horseshoe.||You are completely petrified!||1-4 seconds|
Internal Buff ID: 164
|Causes the player to float upwards and downwards based on their position.||Gravity around you is distorted||6-12 seconds / 5-9 seconds|
Internal Buff ID: 163
|Darkens the screen almost completely, except for a small area around the player.||You can't see!||While attacked by a Brain Suckler|
Internal Buff ID: 144
|Causes the player to take significant damage when moving and a smaller amount of damage when not moving.||You cannot move||4-8 seconds|
Internal Buff ID: 148
|Increases player damage but decreases health regeneration and applies other random debuffs.||Increased damage, Decreased life regen, Causes status effects||3 seconds-90 seconds|
Internal Buff ID: 145
|Prevents the player from healing via Vampire Knives or Spectre Hood.||You are unable to absorb healing effects||14 seconds / 16 seconds|
From items and environment
Internal Buff ID: 94
|Magic damage is reduced by 25%, the amount of damage reduced is reduced by 1% every 1/5 second.||Magic damage reduced by||5-10 seconds|
Internal Buff ID: 21
|Prevents the player from drinking healing potions and restoration potions.||Cannot consume anymore healing items||60 seconds (45 with a Philosopher's Stone/Charm of Myths)|
Internal Buff ID: 88
|Causes the player to lose 1/7th / 1/6th of their maximum health if they use the Rod of Discord again while the debuff is active.||Using the Rod of Discord will take life||6 seconds|
Internal Buff ID: 68
|Players lose life over time while buried in Sand, Slush, or Silt.||Losing life||While in contact with fallen Silt/Sand/Slush|
Internal Buff ID: 67
|Players burn, losing life, life regeneration speed, and movement speed.||Losing life and slowed movement||While in contact with Meteorite, Hellstone, or Hellstone Brick|
Internal Buff ID: 25
|Increased melee abilities, lowered defense||2 minutes|
Internal Buff ID: 119
|Affected entities emit cosmetic red hearts.||You are in love!||30 seconds|
Internal Buff ID: 120
|Green fumes appear around you. (Visual effect)||You smell terrible||30 seconds|
Internal Buff ID: 86
|Increases the spawn rate and max number of enemies on screen.||Increased monster spawn rate||When near a placed Water Candle|
Internal Buff ID: 194
|Pushed based on wind direction.||The wind moves you around!||Infinite while in a Sandstorm|
Internal Buff ID: 199
|Cannot build or break blocks.||You have lost the power of creation!||Infinite during the Old One's Army event|
Internal Buff ID: 72
|Causes affected enemies to drop more coins than usual on death.||Drop more money on death||15 minutes|
Internal Buff ID: 204
|Fires are more effective.||Taking more damage from being on fire||4-9 seconds|
Internal Buff ID: m200
|Completely immobilizes affected enemies.||Paralyzed by love||5-7 seconds|
Internal Buff ID: 103
|Player drips water. (visual)||You are dripping water||30 seconds|
Internal Buff ID: 137
|Player drips blue goo and gains a blue tint. (visual)||You are slimy and sticky||30 seconds|
Internal Buff ID: 320
|Player drips pink goo and sparkles. (visual)||You are slimy and sparkly||30 seconds|
Internal Buff ID: 153
|Deals 15 damage per second to the target.||Losing life||5-8 seconds|
Internal Buff ID: 203
|Defense reduced by 40.||Defense is lowered||5 seconds|
Internal Buff ID: 169
|Causes affected enemies lasting damage for up to 15 seconds.||Bleeding Out||15 seconds|
Internal Buff ID: 189
|Causes affected enemies lasting damage for up to 15 seconds.||Incenerated by solar rays [sic]||15 seconds|
Internal Buff ID: 183
|Causes affected enemies lasting damage.||being eaten by cells||6-9 seconds|
Internal Buff ID: 186
|Causes affected enemies lasting damage.||The power of nature compells you||While in Dryad's leaf shield.|
Internal Buff ID: 160
|Move at one third speed horizontally. Reduced jump height.||Movement is greatly slowed||Unobtainable during normal gameplay|
Internal Buff ID: 192
|Increases movement and mining speed by 20%||20% increased movement and mining speed||Only unobtainable and only a debuff on Switch version and tModLoader version.|
- Players with the Darkness debuff will keep their eyes shut as a cosmetic indicator.
- The duration of the following debuffs, if inflicted on players, is increased by 100% in Expert Mode (i.e. doubled) and by 150% in Master Mode:
- Furthermore, players in Expert worlds are inflicted with the Chilled debuff when they enter water in a Snow biome. The Chilled debuff lasts for as long as the player is in the water and lasts for 5 seconds after getting out.
- The maximum possible damage per second that can be inflicted on an enemy with damaging debuffs is 1331. This can be achieved by consuming a Flask of Cursed Flames, switching between wearing Frost armor and Huntress armor/Red Riding armor and a Magma Stone, and using the Daybreak, Shadowflame Knife, Venom Staff, while having a Imp Staff, a Hornet Staff, a Stardust Cell Staff minion , and a Explosive Trap sentry summons active, against a target that has been Oiled (due to the explosive trap) and within the range of Dryad's aura in a world with all bosses defeated.
- The following weapons inflict debuffs on enemies:
- Desktop 220.127.116.11: Fixed bug that caused Distorted to freeze players instead of changing their movement pattern.
- Desktop 18.104.22.168:
- Added Chaos State debuff.
- Fixed a bug that was causing monsters to only show one debuff on multiplayer.
- Monsters that transform now correctly keep their debuffs.
- Desktop 1.2: Burning, Blackout, Chilled, Frozen, Venom, Frostburn, Ichor Debuff and Suffocation debuffs introduced.
- Desktop 1.1: Bleeding, Broken Armor, Confused, Cursed Inferno, Horrified, Silenced, Slow, The Tongue, and Weak debuffs introduced.
- Desktop 1.0.6: Introduced.
- Console-Release: Introduced.
- Switch 1.0.711.6: Introduced with changes up to Desktop 22.214.171.124.
- Mobile 126.96.36.199: Damaging debuffs no longer deal percentage-based damage.
- Mobile-Release: Introduced.
- 3DS-Release: Introduced.