Trolls and other particularly hardy creatures can regenerate damage at an incredible rate.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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A model with the Regeneration special rule gains a Ward Save (indicated by the number in the brackets). This is cumulative with other sources of Regeneration. Regeneration may not be used against Flaming Attacks, successful Killing Blow (including Heroic Killing Blow) or wounds caused due the unit being Unstable.