Darius should get an "Undead Darius" skin where he is resurrected like Sion.

He becomes like Sion except he somehow retains his memory, at least most of it.

He has quotes like Sion of how he can't feel pain and has nothing to lose.

And he would have special quotes to Draven of sadness that he had died but still vows to protect him(without actually saying that of course)