Here's a description of the orcs of Marduk.

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Brash, brutal, always looking for a fight. This is the mindset of an orc. There are many theories of how the orcs came to be. Some say they were 1st created by magical experiments on high elves. Others say that the 1st orcs were products of Edes Athran. There are too many origin stories to count, and asking an orc about it usually gets you punched in the face. But while their origins may be a mystery, their love of battle is not. Since records began, orcs have been known far and wide for their tendency to seek out the toughest thing then can find, then beat it into submission and/or kill it. This has led to the formation of hordes, massive armies of orcs that work together to beat entire kingdoms into submission...if said hordes can stop their troops from infighting 1st.

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That's all I have come up with so far.