Part of Destiny: Nimble
Level 3
Attuned - Cold.
Gain the Stasis Spell School. Shadow Blast and Shadow Minions may deal Stasis damage.
Coldsnap Legion.
When your Shadow Blast or Shadow Minions would crit, you gain INT+LVL temp HP.
Level 7
Shadowfrost.
Your Shadow Blast also Slows. You can cast Cryosleep or Rimeblades without Pilfering Power by expending 10 temp HP.
Level 11
Arctic Resilience.
(1/Safe Rest) Reaction (whenever you are attacked or would gain a condition), gain 10×LVL temp HP and end ALL negative conditions on yourself. At the end of your next turn, any remaining temp HP are lost.
Level 15
Coldheart.
Pay half your max HP to cast ANY Stasis spell. After casting a spell in this way, you gain an invisible aura: the next creature that hits you with an attack within reach 8 this encounter takes Stasis damage equal to half the HP you spent on this casting.