Vorago is a powerful creature of the earth, located in his Borehole north of the Falador lodestone. The only hard requirement for joining a fight with him is talking to him and going through the chat options "What are you doing here?" and then "Can I face you?". Afterward, verify that you can join the fight by right-clicking and selecting "Challenge", but be careful not to actually initiate a fight or else you'll take up to 12,500 damage each after 20 seconds. Beyond this, surviving the kill requires high combat stats and good gear.