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Heart of Ice is a survival-scaling mutation which lowers the cooldown of skills when attacking enemies which are stunned, rooted, slowed[a] or frozen at close range.


  • Special Effects:
    • Attacking a frozen, slowed, stunned or rooted enemy at close range will reduce skills cooldown by [0.6 base] seconds.
  • Scaling: +0.105 seconds per Survival stat
Number of stats 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15+ ...
Mutation effect 0.6s 0.705s 0.81s 0.915s 1.02s 1.125s 1.23s 1.335s 1.44s 1.545s 1.65s 1.755s 1.86s 1.965s 2s ...


  • The effect has a 0.5 seconds cooldown.
  • Phaser Icon.pngPhaser is extremely powerful with this mutation, as it essentially allows for infinite use of the item.
  • It is also very effective with items that rely on rooting/stunning/freezing for critical hits, such as the Nutcracker Icon.pngNutcracker or the Repeater Crossbow Icon.pngRepeater Crossbow, as it can allow for rapid skill cooldown reduction and open up many powerful combat options.
  • This mutation pairs well with Melee Mutation Icon.pngMelee and a fast swing rate melee weapon like Cursed Sword Icon.pngCursed Sword because you are constantly hitting a slowed target.
  • Attacking with the Heavy Crossbow Icon.pngHeavy Crossbow does not trigger this mutation, as the enemy is only rooted for a short time before the attack itself hits.


  • 1.6: Introduced.
  • 2.1: No longer works with slowed enemies.
    • Now works with ranged weapons at close range.
  • 2.4: Base cooldown reduction decreased from 1 second to 0.6.
    • Cooldown reduction cap decreased from 3 seconds to 2.


  1. In-game description is incorrect. Although it doesn't say it, this mutation works on slowed targets as well.
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