Shallow Graves

Every 10 enemies killed extends the duration by 1 second up to a maximum of 2 seconds.

Unlocked at level 53

Brittle Touch

Enemies become brittle increasing their chance to be crit by 5% for 5 seconds each time they are hit with Corpse Lance.

Corpse Lance's damage turns into Cold.

Unlocked at level 21

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

Harvest of Anguish

Bone Armor also increases your movement speed by 1% for each enemy hit.

Bone Armor's damage is turned into Cold.

Unlocked at level 48

Metabolism

Provides an additional charge but doubles the health cost.

Unlocked at level 60

Unstable Compound

Each cast increases the radius of your next Nova by 5 yards up to 2 times.

Unlocked at level 18