Here is Jack’s post that mentioned orcs. I did some brainstorming at that time, but have now gotten back around to working up a little more detail. Here is a delightful chart you can use to custom-build your own footsoldiers from the World Below.
You can make a jolly band with this table! Here is an example.
“Up there in the hills, we faced the Bile Tyrant’s warband. Front line, he had orcs. They looked like you’d expect, all green and piggy-like. They marched out of the hills with belts of snakeskin, and a big banner they stitched together out of dead lizards. We had two things going for us; they didn’t care much for sunlight, and they didn’t think much of the wizard that summoned them. The night before the battle, they turned on the leaders, then lit out of there. Later, I heard they worked their way south, rounding up villages and sacrificing them to whatever dark lord they worshiped. They also drowned the biggest adults in pools of blood, painted them up, and buried them; turned them into orcs. Well, everybody’s best hope is that either they punch somebody bigger than them, or the clock runs out on their dark energies, they get old, and die.”