Frost Scythe

Each enemy hit increases your attack speed by 1% for 5 seconds. Max 15 stacks.

Grim Scythe's damage turns into Cold.

Unlocked at level 45

Metabolism

Provides an additional charge but doubles the health cost.

Unlocked at level 60

Shallow Graves

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

Unlocked at level 53

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

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

Horrific Return

When you revive a corpse, enemies within 20 yards run in fear for 3 seconds. Damage dealt is turned into Poison.

Unlocked at level 31