Amalric's presence is deadly to all manner of unliving creatures, dispelling the unholy magics that bind them together.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Any units with the Undead special rule in base contact with Amalric at the start of the Combat phase automatically suffer D6 wounds which Ignores Armour Saves. These wounds count towards combat resolution.