Impervious Runeward

Like the rune knights of old, summon a shield that absorbs 9916 damage for 1 second, and then 2203 damage for 5 seconds if the first shield persists. Both shields scale off your Max Health. The first time you take direct damage, the shield retaliates and deals 0 Magic Damage to the attacker, scaling off your Armor. Consume Crux to heal yourself for 1600 Health, scaling off your Max Health, per Crux spent. Drastically increases the size of the damage shield for the first second but reduces the size of the shield after.