Opposing force to what? Us? The Gods? My army that I know exists but you refuse to grant me?
Hobgoblin Empire.
I've long since given up on railroading you guys, besides, making stuff up on the spot is fun for me too (when i'm not tired). Plus, unless you all run back to the teleporter and zoom off somewhere else, you are going to end up in at least the general vicinity of this stuff.
Wait, so it's an Empire now? Is it too late to re-roll a Luke Skywalker expy?
But in all honesty it does make sense. For those of us who actually were present for the start of this campaign, happen to remember that battlefield full of useless junk that appeared to be between hobgoblins and orcs? I guess that was the hobgoblins expanding their territory. Or defending it. Or just driving off some green gypsies; honestly, who cares, we have shit to kill!
Hobgoblins traditionally have major issues with Orcs; Orcs tend towards rampant chaotic barbarism, living in small tribes and breaking things for the hell of it. Hobgoblins tend towards meglomanical empire building to shame the Romans and strict regimented order. The two rarely get along.
Orcs breed like, well, Orcs, so despite their lack of technological superiority they are always a credible threat to even the most well establishsed Empires, the Hobgoblins tend to counter this with well trained soldiers and breeding programs.
But it's always nice to have a third side, since the Hobgoblins hate\fear the PC's, and the Orcs are just as likely to eat you as they are to side with you, i figure you need a more solid group to help out, Hello Undead, you'll do nicely.