Gruumsh is the chaotic evil god of destruction, lord of marauding barbarian hordes. Where Bane commands conquest, Gruumsh exhorts his followers to slaughter and pillage. Orcs are his fervent followers, and they bear a particular hatred for elves and eladrin because Corellon put out one of Gruumsh’s eyes. The One-Eyed God gives simple orders to his followers:
Conquer and destroy.
Let your strength crush the weak.
Do as you will, and let no one stop you.