Part of Destiny: Nimble
Level 3
Frost Field.
Gain a 4 space aura. You can interpose for an ally anywhere within your aura. Shields gain +WIL armor, and you Chill the attacker when you Defend or Deflect with a shield.
Level 7
Flash Freeze.
When you interpose, the attacking enemy is also taunted and chilled by you until the end of your next turn.
Level 11
Warding Crystals.
You and allies in your aura cannot drop below 1 HP. Whenever this triggers, they gain 1 Wound instead (they still die at max Wounds).
Level 15
Stasis Shielding.
You halve all damage while interposing.