Confused the heck outta me. Camping the gobbies in the jail for hours on end for keys for my Whistling Fists quest, and a spider pops.
Takes me a minute to clear my utter confusion. Hours of nothing but goblins. Killed the 'pider, nothing but silks and legs.
Very odd to have a spider as a rare spawn in the jail in front of the little stew-cooker thing.