During conversation the topic of using the Witch grand hex Eternal Slumber against a Tarrasque as a hypothetical method of a more permanent defeat outside of the typical beat it unconscious and wish/miracle. Since the Tarrasque is immune to mind affecting spells and I made the assumption that Eternal Slumber is acts as mind-affecting so therefore it would be immune but he stated that it does not have any reference to being mind affecting.
This seems like dirty rule lawyering but he does have a point, it does not state that it is mind-affecting. Perhaps is its own special class of silliness but this seems unlikely because Apple of Eternal Sleep exists which acts just like the witch eternal slumber hex and is of the enchantment school and so mind-affecting.
On the other hand a mind-affecting spell that you only get at level 18 is pretty much useless because everything and their pet monkey is immune to sleep at that level.
