Demon Slayer is a buff inflicted permanently after consuming Bill's Soul.

It gives the player the following bonuses:

  • +10% melee speed
  • +20 armor penetration
  • 25% chance not to consume ammo
  • Increases max amount of minions and sentries by 1
  • A chance to release additional throwing projectiles

The player will also receive immunity to the following 19 debuffs:

  • Mana Sickness
  • Poisoned
  • Darkness
  • Cursed
  • On Fire!
  • Bleeding
  • Confused
  • Slow
  • Weak
  • Silenced
  • Broken Armor
  • Cursed Inferno
  • Frostburn
  • Chilled
  • Frozen
  • Ichor
  • Venom
  • Electrified
  • Oozed
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