Goombas are beings who resemble small, brown mushrooms. They have limited intelligence, and are often regarded by the "superior" races (humans, elves, etc.) as inferior even to the goblins, despite their thriving culture and complex belief system (gamatism). They are found in the stonegrass plains, all other areas of the "civilized" world having shunned them. They are hostile because hostility is all they have ever received, not because of any mental problems or anything. Seriously, be nice to these guys. They've been through a lot.