Source: Warhammer Armies Project: Unofficial 9th Edition

The Red Thirst
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Whenever a model with this special rule kills one or more enemy models in close combat, roll a D6 at the end of the Close Combat phase. On the roll of a 5+, the model recovers a single Wound lost earlier in the battle. This does not work against models with the Animated Construct, Daemonic, Forest Spirit or Vampiric special rules.