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.