So I've been thinking. Colmma Noldray actually can't be a Dracolich. Don Joswee is the God of Death. It has been established that the Frost Giant clerics of Don Joswee ritualistically hunt down Vampires because their undeath is an effrontery to the God of Death and a bastardization of the normal order (Lawful Neutral).
Therefore, Colmma Noldray is a Death Dragon and possible Demigod or Avatar.
Back, near the end of the second age, when the Undying finally put their plan into motion, Colmma Noldray and the servants of Don Joswee had largely interrupted the Ordening and had created a new order. Using the Books of Names in conjunction with other strong magicks, the Undying locked Colmma Nodray in a time loop and sunk his tower into the earth to lay trapped for all of time.
That is, until the machine that fueled their reality was broken by a group of adventurers and the time lock was broken. Now Colmma Noldray is risen and his cold, evenhanded wrath only needs to be directed.