Quote Originally Posted by Puksi View Post
Do they ever explain the "terrible, grating voice"?
There are five doors in Lyhe Mheg, which would correlate to each area of Norvrandt (minus the Tempest which is presumably tied in with Kholusia).

In light of that, I would posit that the last door is Il Mheg's and the voice speaking to An Lad is perhaps their nightmare.