The Body Beyond is a trait of The World Beyond.
Upon the shores of Madness and Beyond: Many undead are bound strongly to experience their surroundings as The World Beyond – part of The Void. Usually this involves a sacrifice of a [pillar] Aptitude in exchange for Void Aptitude – a pollution of Essence. Reality which is Void Washed appears as a sickly set of threads in The Pattern. The presence of The Void to expose The World Beyond can come from Affliction and twists and tears in The Pattern. The Caress of the Void can cause permanent physical and psychological scarring, in addition to the particularly nasty trauma of Psychic Scarring.
No Rest Beyond: Even those with this “Beyond” feature require rest that can only be gained through a form of Meditation – this is how they recover essential non-material reserves.
Move Through Pain: Each day (or appropriate cycle) renews (at sundown?) 1 use of Resilience. They take no additional damage from Critical Hits (secondary effects apply as appropriate). The manifested shell/form of these creatures may be bound by The Form Beyond .
Suppressed Biology: Immunity to any natural Poison or Disease effects.
A creature with Body Beyond cannot be killed, but can be ‘Quieted’. The body will collapse, as long as there is a single cell, it can be regenerated. It is a gruesome process. It can be disintegrated to kill it permanently. The remains eat bacteria, organelles, anything it can. Growing a mouth first, it can be fed it appropriate sustenance for its Essence Hunger. Divine powers targeting undead specifically can inhibit this greatly, with repeated uses stopping the process entirely.
d20 [specific] Requirements: