Stake

Used during the quest Vampire Slayer.

To obtain it go to the Blue Moon In.

To go to the Blue Moon Inn, you have to go to Varrock. When approaching from the south, you will see first a cottage to the east, and directly north of it, an inn with a blue moon sign. This is the Blue Moon Inn. Once inside, talk to Dr Harlow. Tell him Morgan needs his help. He will want you to buy him a beer. Find the bartender, buy a beer, and then talk to Dr Harlow. He will talk about vampires and give you a stake.