Badge is extremely easy with a Golem Juggernaut (or any class, really). Grab some equipment with shield, and fight enemies in the first 6-8 rooms until you get 25 armor and about 40-50 willpower (can do with less). Then, turn on shield and immediately rush for the exit hole, spamming shield as necessary (yellow dot, preferably following the path with least mobs). Regenerate health and magic each descent. You should have more than enough for even the linear-path rooms.