Frost Armor is a Stasis-specific benefit you can apply to yourself or others through various effects.

You can carry up to 6 stacks of Frost Armor. If unused, these stacks last until the end of a long rest. When you take damage, for each stack of Frost Armor you hold, you can choose to reduce that damage by [1d4]. If you spend 6 stacks of Frost Armor at once, you instead reduce the damage by [1d8] per stack.