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. It's an orb effect and buff placer.

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