From Ardrana

Niradal was a member of the Elven Council of Shael i'Vor who was somehow removed and replaced by a spy for the Servants of Kuraliskar. That person then set free a number of prisoners, including Vel'thyl, who caused chaos and confusion, drawing the Elves' attention away from Lassomaranza, allowing it to be seized by the Maluur.

Niradal's fate is unknown, but it is likely he was slain by the Servants to further their plot.