Jyrik Gauldurson

Jyrik is a mini-boss Draugr that you will encounter deep into Saarthal if you are doing the quest "Under Saarthal" which is a part of a quest-chain if you are joining the College of Winterhold (Mage's Guild)

When you first enter his chamber and engage him he will be immortal, but after about 20 seconds Tolfdir will start channeling a spell to the big orb in the room which will make Jyrik vulnerable!

After defeating Jyrik you can loot him for some trash, but he also drops the Gauldur Amulet Fragment (which is needed for the Forbidden Legend quest) and the Writ of Sealing, a small note that reads:

"Be bound here, Jyrik, murdered and betreyer. Condemned by you crimes against realm and lord. May your name and deeds be forgotten forever, and the charm which you bear be sealed by our ward!"

Reading this note will automaticly accept the quest "Forbidden Legend"