Gudrik Halbaddon is a retired dwarf adventurer who can be found east of Gerrant's Fishy Business in Port Sarim. He accompanies the player during the tutorial, and may take them back to Ashdale, should they desire to do so. He gives players a ring of potency should they lose it, and he also starts and finishes the quest A Shadow over Ashdale. Besides the ring people can also (re)claim their pathfinder armour as well as the journal entry and smuggler's journal from him.
He was an adventurer for over eighty years and claims to have explored "every dungeon, ruin and tomb" on RuneScape. He lost his left arm in a kalphite attack when he accidentally disturbed a hive in the Kharidian Desert.
After Morwenna the Cruel died, back in his adventuring days Gudrik plundered her tomb. He thinks this might have something with why she came back, and says he didn't know she might come back from the dead.
- He has a gravestone in the New Varrock graveyard which reads "Gudrik Halbaddon. the finest crassian-zombie-dwarf you could ever hope to meet."
- He is a three-time winner of the Keldagrim Beard Awards.
- When asked who he is, he describes himself as the "Proud member of the Society of Intrepid Adventurers, and three-time winner of the Beard of the Year award." This resembles how Professor Gilderoy Lockhart described himself in Harry Potter and the Chamber of Secrets: "Honorary member of the Dark Force Defence League, and five times winner of Witch Weekly's Most Charming Smile Award."