Use a tinderbox on the lantern.
When you get the lantern go down stairs and find a barrel and click it. Then the lantern will light up.
To light the lantern in the haunted house you have to go to the floor you came in on and click on the kerosene barrel.
You can get an unlit bug lantern from any of the Slayer Masters in Runescape. You must have Level 33 Slayer to equip it and it acts as a shield and helps when fighting Harpie Bug Swarms.
You need to get Swamp Tar and take it to the chemist in Rimmington where he can turn it into oil.
you go downstairs and go under the stairs where you came in and there will be a barrel that says kerosene and click on it.
You don't but in order to get a lit oil lantern you should check out the crafting guide for more answers.
You purchase a Harpie Bug Lantern from any slayer master, you must have it equipped to do any damage to the swarm.
Buy a tinderbox from any general store then use it with your lantern.
You need to make a bullseye lantern and make a sapphire lens. Also oil so it will burn. Lit it by them and they will take you across.
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You can craft it using molten glass and a glassblowing pipe. 49 Crafting Level is required. You can also buy one from the Grand Exchange in Varrock.
it deflects red lantern,yellow lantern,and orange lantern attacks. it also doubles green lantern powers,and if it just releses pure blue lantern energy, it can turn off red lantern powers completly.