Zardnaar
Legend
Hit points stopped mattering on monsters around the level the casters could turn them off with a spell.
Why did 3x monsters have 'bloat'? It's so they might be around after the three to twenty guaranteed rounds of being held, paralyzed, suggested, slept, debuffed to nothing, polymorphed, dominated, or sealed in [insert element].
I've got a bard in PF1 right now that just hit level 10 and the idea of something trying to have HP at me is adorable.
In my spellcasting overhaul I'm looking at redoing saving throws similar to AD&. At level 10 boss fights woukd make their saves 85-95% of the time assuming your spell didn't outright fail (25-75%).