Visit Falador and contact Savant. She will suggest using rubium again to boil the water away and then use an expanded Fire Rune to ignite the place. The Rune Essence can be teleported to OSRS Gold as you like, and use a hammer, rock hammer or any other warhammer on the essence to make a pur essence chunk. This is made by the Fire Altar. Withdraw 5 more rubiums from the bank. In order to put out...