True, but once opponents of level 5+ are all you see, one 4th-level is almost certainly better than six 1st-levels...unless you're really desperate to get casters to waste their area spells early in the dungeon.<br/><br/>And really, you can hardly blame us for trying to supersaturate the dungeon with traps when minions require so much space!  (Although the adventurers seem to notice traps pretty effectively.  We should get a ghost or something on duty to set off traps around intruders who are about to avoid them.)