Crandor
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Crandor is a small volcanic island north of Karamja, Players can access Crandor during and after the quest Dragon Slayer. During the quest you have to enter the mountain with a ladder at its very peak at the end of the pathway. The entrance to elvarg's cave. Only one person may do that part of the quest at a time. Currently the dragon is bugged and if you press the button but do not enter or you die without finishing the quest you cannot re enter the chamber.