WoT If… Thom Knows the Dark One? in Theory Blog Posted March 13, 2014 There's a few interviews--with Jordan and Sanderson--where they talk about Mordeth. He did go to the Finns to ask how (it had to be the Aelfinn) to stop the Dark One. Whatever answers he got only corrupted him and, no doubt, the Aelfinn were alluding to Rand using the evil Mordeth created as the siphon to cleanse saidin. I suppose whatever dark arts he got into could have made him immortal without the aid of Mashadar. But, I'm curious if there is a link between the two of them still.