Transcendence

20th-Level Psion Feature

At 20th level, your mastery of psionic power causes your mind to transcend the body. Your physical form is infused with psionic energy. You gain the following benefits:

You gain resistance to bludgeoning, piercing, and slashing damage.
You no longer age.
You are immune to disease, poison damage, and the poisoned condition.
You can add half your proficiency bonus, rounded down, to any saving throw you make that doesn’t already include your proficiency bonus.