Surok Magis

Surok Magis is the head of the Dagon'hai order in the What Lies Below quest. He is found imprisoned in the Varrock Library.

History
Surok Magis is quite possibly the succesor of his father which lead the organisation after the discovery of the Tunnel of Chaos and exile from Varrock.

Surok eventually returned to the Tunnel of Chaos years later with his followers after almost all knowledge of their organisation faded. He then turned his attention to the plan that had been foiled years earlier at the discovery at the tunnel which was to create a reincarnation of Zamorak's will.

He came to the Varrock library where he met Rat Burgiss, the leader of the Varrock Palace Secret Guard. He sends a player to give Letter to Surok to Surok. After destroying it he uses the adventurer to gain materials required for the ceremony.

Quest
He gives player a Sin'keth's diary and a wand and sends him/her to infuse it at chaos altar. After giving Infused wand to Surok, Rat reveals that Surok is actually trying to take over Misthalin!

So player must ask help from Zaff, who gives him the Beacon Ring to take down Surok.

Using infused wand Surok takes control of King Roald's mind and orders him to kill the player. When the king is at 0 hp, activated Beacon Ring brings Zaff to there and he uses a spell to counter Surok's mind control spell.