Talk to Sir Kitree (you need the above requirements to get through the gate, except for the 40 Ranged). He will announce that he is a White Knight that has heard about you slaying a dragon, finding Sir Vyvin's sword, rescuing Prince Ali, and ruining the Black Knights' plans. He will tell you that the Black Knights are planning to reawaken a beast from the Wilderness Volcano. He will tell you to talk to Sir Amik Varze.