Go to the North Wing Stacks on the first floor of the Library, then take the teleporter at ( 260, -20, -285 ) /waypoint 260, -20, -285 to the Elemental Portal Gallery. Use the portal at ( 728, 412, -337 ) /waypoint 728, 412, -337 to enter.
Emotes Morgelon the Wilder glares in your direction (frontal?)
Elemental cures needed
Cross the flame bridge and kill (a conflagrant emissary) in the tower at ( -443, 59, 288 ) /waypoint -443, 59, 288
Kill Moracar, the Fiend inside a tower at ( -367, 43, 372 ) /waypoint -366.53, 42.52, 371.70.
Kill unstable spirit globes as they spawn, otherwise they despawn and respawn as much more powerful adds. Multiple unstable spirit globes can spawn at the same time. For classes with few AoEs, save them for the spirits or you will likely run out of time before they despawn.
Kill a seared advocate in the tower at ( -86, 78, 418 ) /waypoint -86, 78, 418 (there are other mobs in the tower as well).