Mattin

Mattin is a Mysterium Inquisitor NPC in Sanctum Mysterium, Celestial Hills. Mattin is subject of timed protection quest in single person instance Sanctum Mysterium Forecourt during story quest Building a Mystery.

After attack is repelled Mattin gives his report to be delivered to Velika.
 * Report to Inquisitor Mattin at the Sanctum Mysterium.
 * Speak with Mattin and teleport together.
 * Inside instance speak with Mattin again and defend him from attack.
 * Use the teleport option to teleport into a mini-instance and select "Protect Mattin as he works"

Mattin is also part of fishing quest. You need to catch him a Giant Blue.