Gruumsh

He Who Never Sleeps, He Who Watches, The One-Eyed God

Gruumsh is a brutal leader, devoting all his time to conquest. Since the dawn of time, the other gods have cheated Gruumsh out of territory for his creations, and in a rage, he created all the caves and caverns that orcs would inhabit. Since then, his directive has been for orcs to conquer the world above.
The shamans of Gruumsh are much like their conquering lord; they believe that the strong rule by force, that taking what belongs to weaker creatures is the natural order of things, and only by growing their forces can they hope to please their god.
Falling on the last day of Marpenoth, the Feats of Vengeance is the highest holy day for orcs. Those wanting to duel are seen as blessed if they do so on this day and win. For others, the day is about recalling their victories over their enemies (elves in particular).
Once a month, under the dark of a new moon, a sacrifice is made to Gruumsh. This sacrifice is made to maintain the blessing of strength that orcs believe Gruumsh grants them, and failure would sap this strength entirely.
Whenever and wherever shamans can erect shrines to the one-eyed god, they do so. A shrine is considered better than others if it is built on conquered lands.

Divine Classification

Tempest and War domains

Alignment

Chaotic Evil