Gideon Bede

Gideon Bede is a Saradominist scholar and librarian from the Edgeville Monastery who is featured in the Demon Slayer quest. Prior to the events of the quest, a powerful tome of demonology that could be used to summon the demon Delrith was taken from his library by Denath, a mad wizard, and he comes to Varrock in search of Silverlight to stop Delrith if he is summoned. He requests the adventurer's help in obtaining Silverlight, while he tracks Denath, and once Silverlight is retrieved, the adventurer fights and defeats Delrith.

During the battle with Delrith, he will create a holy barrier to help protect both himself and the adventurer from Delrith's attacks, though after the quest, he admits that he is surprised the barrier even worked.

He will also replace the Avernic wand and book for free after the quest.

Trivia

 * He was previously known as Grüfeld Bach, and was a Saradominist priest and demon hunter.
 * Gideon's surname is most likely a reference to Saint, a monk and scholar from the Middle Ages who lived in a monastery with a grand library.