With so many Trolls in one place, their regenerative properties seem to be in overdrive, slowed only by scorching flame, potent magic and legendary weapons.
Source: Warhammer: The Old World Online Rules Index
Enhanced RegenerationURL Copied!
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Models with the Regeneration (X+) special rule within a Troll Horde army may re-roll any failed Regeneration saves against Wounds caused by non-magical attacks.