Stormreaver

Aura of Corrosion reduces your attack and magic damage based on total amount of damage you have dealt to the unit so far.
Cloud of Death may kill some of your units instantly. Chance of being killed grows with total amount of damage you have dealt to the unit so far!
Unit's anger causes splash damage which hits every single member of your army. Rising total damage dealt to unit makes Explosion of Anger hits stronger than before!
Bigger, stronger and more angry than his cousin, this armored colossus is a pinnacle of brute force. Their job is clear - to secure by force those sources where their brethren failed. Their unmatched speed, might and the ability to control storms and lightning make them outright deadly.
"...and on the blackest of days the Storm will come. The Storm will ravage, kill and destroy. Yet the Storm alone will only be a prologue to Death."
The Prophecy of Akul-Tun, The Book of Black Sermons