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This article is about the debuff. For the modifier, see Modifiers § Common.

Slow is a debuff that halves the player's horizontal movement speed. It has a chance to be inflicted by direct contact from a Pixie, Wraith, Mummies or Rusty Armored Bones. The beams fired by Necromancers also have a chance to cause this debuff. Equipping the Fast Clock, The Plan, the Ankh Charm, or the Ankh Shield makes the player immune to the debuff.


From enemy

From Duration Chance
Pixie Pixie 15 / 30 seconds 12.5*1/8 (12.5%)
Wraith Wraith 15 / 30 seconds 12.5*1/8 (12.5%)
Mummy Mummy 15 / 30 seconds 12.5*1/8 (12.5%)
Rusty Armored Bones Rusty Armored Bones 5 / 10 seconds 22.22*2/9 (22.22%)
Necromancer Necromancer 5-16 / 10-32 seconds 100*1/1 (100%)
Skeletron Hand (NPC) Skeletron Hand 0.5-1 seconds 50*1/2 (50%)
Brain of Cthulhu Brain of Cthulhu 8.75-17.5 seconds 12.5*1/8 (12.5%)
Creeper Creeper 8.75-17.5 seconds 4.17*1/24 (4.17%)
Deerclops Deerclops
12 / 24 / 30 seconds 100*1/1 (100%)

From debuff

From Duration Chance
Feral Bite Feral Bite 2.1–3.5 seconds 16.67*1/6 (16.67%), 5*1/20 (5%) every second


From Duration Chance
Red Potion Red Potion 1 / 2 / 3 / hours 100*1/1 (100%)


  • If the player has any boots that increase movement speed, such as the Frostspark Boots, it will take much longer to accelerate, but the player can still move at the maximum speed allowed by the boots.
  • If the player has nothing equipped that affects movement speed, they will move at the same speed even when the debuff is active.
  • If the player is afflicted by the debuff and uses the sandstorm jump via Sandstorm in a Bottle, Sandstorm in a Balloon, or the Bundle of Balloons, they will spin much faster than normal during the ascent.


  • Desktop 1.2: Now inflicted by the Necromancer's beams, and Rusty Armored Bones as well.