When using the Gravity Slime Guardian, do you determine it's HP progression as per Endeca’s gregarious gravity slime on page 9 (example 25 HP for adult) or as hit die as per a normal eidolon?
You determine the HP as per the Eidolon. My apologies if I was unclear.
Why did I read the title as saying "Gravy Slime"? If someone wants a holiday-themed monster ...