Your physiology is closer to the arbiters who remain on their homeplane.
Benefit: You gain +1 hit point for every hit die you possess. Whenever you gain a hit die, you gain +1 hit point. You also gain a +2 bonus to saving throws you make against death effects, disease, mind-affecting effects, necromancy effects, paralysis, poison, sleep, and stun.
Special: This feat counts as Toughness. You can’t have both this feat and Toughness.
The Book of Many Things, © 2018,Samurai Sheepdog; author Kevin Glusing.