Make sure you visit Karil first. You can pray attack prayers prayer, strength and protect from range, and take him down with your powerful attacks. Make RuneScape Gold him fall with your ice magic. Run out. Go to Ahrim. There are about 30 prayer points. Switch to range gear, pray magic (and the eagle eye, if you have it). Run out when he's dead.
Go towards Dharok next. After this, you should have 1-5 prayer points left. Invoke melee to get his first hit, then hit him once with an ice blast before stepping away. You can normally get in five more hits. He'll start moving by 5th hit which means you should be far from best way to buy osrs gold him if you wish to hit him five times, or else, you can hit him four times, then hide behind his tomb. After a few seconds, go to a corner away from him and take another hit before reaching him, then repeat. You can finish him by doing this.