Frost Spikes

Leaves a frost patch that reduces the movement speed of enemies by 60% for 2 secs.

Bone Spikes' damage turns into Cold.

Unlocked at level 25

Shatter

Instead of piercing now detonates on the first enemy hit dealing 500% weapon damage as Physical to all enemies within 15 yards.

Unlocked at level 28

Devouring Aura

Becomes an aura that consumes all corpses within 15 yards to restore 11 Essence per corpse.

The range of this effect is increased by 50% of your gold pickup radius.

Unlocked at level 38

Aura of Frailty

Becomes an aura that curses all enemies within 15 yards.

The range of this effect is increased by 50% of your gold pickup radius.

Unlocked at level 39

Self Sacrifice

If you would die with a Simulacrum active, instead the Simulacrum is destroyed and you are fully healed.

Unlocked at level 65

Metabolism

Provides an additional charge but doubles the health cost.

Unlocked at level 60