The lighthouse key is an item used in Horror from the Deep. It is given to the player by Gunnjorn, who is inside the Barbarian Outpost Agility Course after starting the quest, and is used to unlock the door to the lighthouse north of the Barbarian Outpost. If lost, it can be re-obtained from Gunnjorn; however, you do not need to use the key to unlock the lighthouse after you have already unlocked the door once. It can also be re-obtained at May's Quest Caravan after putting 150 quest points into the Hub Track. This key cannot be attached onto the steel key ring.