Sir Ehntor Prysin is one of King Roald's knights. His grandfather was Waldo, the author of The Tales of Wally. He is located in the west part of Varrock castle, on the ground floor. He is the great grandson of Wally who defeated Delrith 150 years ago, and, as such, is the custodian of Silverlight. To reduce the risk of Silverlight falling into the wrong hands he gave a key to wizard Traiborn, Captain Rovin and kept a key for himself, though he dropped it in the drain and lost it in the Varrock Sewers. If players loses Silverlight after the quest, he will return it for a fee of 500 gold, stating the importance of the sword.
During the quest Demon Slayer, it is revealed by Captain Rovin that Sir Prysin got his very own luxurious room in the palace as well a knighthood only because his great-grandfather, Wally, defeated the demon. Captain Rovin also shows great dislike towards him, and when asked by the player to hand over one of the Silverlight case keys, he rudely snaps at the player, telling him/her that he reports directly to the king and not ' that ill-bred moron '. He also states that he only got the key because the king ordered Sir Prysin to hand one over to him.