Lol right!
I forgot that... and didn't check because often many details like that aren't well describe in descriptions, like description of res from inq doesn't mention it doesn't affect demons... nor undead.
EDIT: And about defeating the turtle a possibility is to use Magic Spring and Last Hero on a stack with a single unit. With that trick and even with a very low mana level that does the job with no death. Quote the reward for defeating the turtle is those 2 spells.