The Reaper of Obilterax

Model equipped with bonesword or monstrous bonesword only. That model's bonesword or monstrous bonesword gains the following abilities:
• Each time an attack is made with this weapon, if that attack successfully wounds the target, the target suffers 1 mortal wound in addition to any other damage, to a maximum of 3 mortal wounds.
• Each time an attack made with this weapon is allocated to an enemy model, that model cannot use any rules to ignore the wounds it loses.