Realm of Chaos: Slaves to Darkness (1988), p129 — 756-760 Rapid Regeneration

The mutant can recover very rapidly from injuries received in battle.

At the end of any turn during which the mutant has suffered one or more Wounds it may try to regenerate, even if it is 'dead'. Roll two D6. If either (or both) throws result in a 4, 5 or 6 all lost Wounds are recovered. If the regeneration roll is unsuccessful the mutant loses the Wounds in the normal manner and cannot regain them during this battle (WFRP: must heal as normal). A mutant may regenerate Wounds any number of times, so long as it continues to roll a 4, 5 or 6 on either die when testing for regeneration. It may even return from the dead several times during the course of the same battle.