The Slann's sheer force of will alone allows him to reconstitute his body.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Transcendent HealingURL Copied!
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Ability30 points
If this model is alive at the end of any friendly Magic phase, roll a number of D6 equal to the difference between the Slann Mage-Priest's starting number of Wounds and its current number of Wounds. For each roll of a 6, the Slann Mage-Priest immediately recovers a single Wound lost earlier in the battle.