Today a friend was facing a Cryx list I did not get to meet. It was under the leadership of pGoreshade, (he says the warcaster had a 'female' companion which I'm guessing was the Deathwalker, (never used pGoreshade). He attacked a unit of Banes, (either Knights or Thralls), and the turn after he had killed some of them A FIGURE in the vicinity of the unit brought them back into play next turn. Clearly not a Necro-surgeon, not even an improperly used one, (he's faced mine on many occasions), nor was it Bane Lord Tartarus adding to the unit, because these were not models killed by him. Apparently Tartarus was not on the table. He is also equally adamant that he was not facing Revenant crew, he'd recognise zombie pirates if he saw them, so this was not a QM doing its job.
So what was it? Goreshade had already popped his feat and brought in the minimum unit of Bane thralls, so it was clear this was not a Feat event. Nor was it Epic Goreshade, so it could not have been the Bane Bond. I may be missing something really obvious but I do not recall any Cryx model with this capability. (bring back Bane casualties? Yes please!)