Chaos Spawn

Some models have 'Feel No Pain x+' listed in their abilities. Each time a model with this ability suffers damage and so would lose a wound (including wounds lost due to mortal wounds), roll one D6: if the result is greater than or equal to the number denoted by 'x: that wound is ignored and is not lost. If a model has more than one Feel No Pain ability, you can only use one of those abilities each time that model suffers damage and so would lose a wound.

If your Army Faction is HERETIC ASTARTES, each time a unit with this ability is selected to shoot or fight, it can make a Dark Pact. If it does, it must first take a Leadership test before any effects of the Dark Pact are resolved; if that test is failed, that unit suffers D3 mortal wounds. Then, select one of the following abilities for that unit’s weapons to gain until the end of the phase:
■ [LETHAL HITS]
■ [SUSTAINED HITS 1]