I'm in dimension 2 now, started a few weeks ago; and all the monsters in the wilderness for dimension 1 and 2 except bosses seem to die in one hit no matter what I'm attacking them with, even with pretty weak attackers. I've used damaging scrolls that do a quarter %hp damage and it shows most of the enemies taking just 1 damage from them, or taking like 30 damage; indicating that their VIT must be incredibly low.
Bosses, as well as monsters in the tower, seem to have normal HP amounts.