Impervious Runeward is an Arcanist Skill, found in the Soldier of Apocrypha skill line.
Base Skill: Runespite Ward
|Like the rune knights of old, summon a shield that absorbs 9916 damage for 1 second, and then 5950 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.|
Impervious Runeward is a morph of Runespite Ward base skill. The other morph is Spiteward of the Lucid Mind.