The one and only **truth** is that the game mechanics are rezzing everyone. Anything else is an imagined belief in a story someone came up with either thru days of focused thought, deliberation with colleagues and playing devil's advocate or simply pulling it out of the part of their body that warms their chair. Where did the Night King get his ability to raise the dead .... from GRRMs imagination. The reason is whatever he says it is and that's all there is to it. If he says something different tomorrow, then that is what it is as of tomorrow..