Frost Fury Waraxe
When this weapon’s wielder is bloodied, the axe blade becomes
icy and promises a cold death with each swing.
Enchantment bonus:: 2, 1d10, Axe, Versatile, Martial Melee)
Enhancement: Attack rolls and damage rolls
Critical: +1d6 cold damage, or +1d10 cold damage while
Property: While you’re bloodied, this axe deals extra cold
damage equal to your Constitution modifier.
Source: Adventurer’s Vault 2