Desolator

The Desolator is an Item purchasable at the Main Shop, under Artifacts.

Corruption
Causes attacks to place a buff that reduces armor by 6. Lasts 7 seconds and works on buildings. Unique attack modifier.

Trivia
In the transition from DotA to Dota 2, Desolator's name was changed from the Stygian Desolator to simply Desolator.