Crusaders. Or rather Spiraders.

Not in a good way either. We crashed on this planet, figured out there's a core that we might be able to harvest energy from, and kill EVERYTHING between us and the core.
We slay beasts, trying to defend themselves and find some dinner and raise their pups.
We murder Gremlins, simply doing their job trying to defend the core from anyone who threatens, because who knows what the core really is?
We destroy constructs, who are basically doing the same thing.
We banish Undead, poor lost souls forced to suffer for eternity until some knight burns/bludgeons/freezes/slices/shocks/blasts to true death.
We kill fiends, who are also doing their job to resurrect ancient beings and push buttons, and who really don't like it when their work is interrupted.
We melt slimes who are trying to reproduce like every other organism.

Think about it. It's not like they would bother us if we just stayed in Haven. Sure, you got the occasional chroma whelp who wanders into things, but come on. The Gremlins only built the Roarmulus Twins to stop us from reaching the core. The core is probably something really dangerous that we really should not have access to.
Have you ever stopped to think about the countless gremlins you have killed in cold blood, just looking for a BLOODY SHIELD?!?!?