The ringing of the arcane bell atop the Corpse Cart inspires Undead minions to continue fighting, even when grievously wounded.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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When a friendly Wizard within 6" of an Unholy Lodestone successfully casts Invocation of Nehek, they may re-roll a single D6 to determine how many Wounds are restored.