Do you think the Ironborn words “What is dead may never die, but rises again, harder and stronger“ have something to do with wights? There are parallels. The wights are dead but walking around&killing,they can’t be killed like normal adversaries,only with fire,even as they are hacked to bits they keep fighting. Their god is also a died-but-not-dead being,the DROWNED god. Their holy ritual consists of drowning(killing)&reviving. The wights are ‘revived’ corpses.