Foul and unnatural creatures, such as Trolls, Daemons and the Undead, can regenerate all but the most grievous of wounds with ease.
BackSource: Warhammer: The Old World Online Rules Index
Regeneration (X+)URL Copied!
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Immediately after a Wound is lost, but before models with zero Wounds remaining are removed from play, a model with this special rule may make a 'Regeneration save' roll by rolling a D6 and comparing the result to its 'Regeneration value', shown in brackets after the name of this special rule (shown here as 'X+'). If the Regeneration save roll equals or exceeds the model's Regeneration value, the lost Wound is recovered, but is still counted for the purposes of calculating the combat result. Rules that affect armour values do not affect Regeneration values unless stated otherwise.