These ice-white bracers let you pass unseen, but their power freezes you to the marrow if left unchecked.
Arms Slot 425,000 gp
Power (Cold, Illusion) (Free Action)
Trigger: You score a critical hit using a cold power or reduce an enemy to 0 hit points using a cold power.
Effect: You become invisible until the end of your next turn. Sustain Free: The invisibility persists, but each time you sustain it, you take 5 cold damage that can't be reduced or prevented in any way.
Published in Adventurer's Vault 2, page(s) 125.