Auri is an elementalist boss that always spawns in the same location in Kinya Province. He is surrounded by other Crimson Skull engaged in a party until aggroed. Curiously, he does the Warrior dance instead of the normal elementalist dance and the Crimson Skull that surround him also tend to do emotes including cheering and playing instruments.
Location
Kinya Province Go left when coming from Sunqua Vale and you will run straight into him.
Auri the Skull Wand carries the spell Immolate. This spell can only be found in Prophecies, so you may capture it from him with a Signet of Capture if you want it in factions.