They actually both went to the Great Monolith that day. Nal was actually honored with a vision, while Hirk had been met with only silence, and in his jealousy Hirk murdered Nal on top of the sacred mountain of Dun's'kaareen. Then Hirk went back and murdered almost all of Nal's followers, and lied to his own followers saying the paragraph above. Not much else has been heard of about the tale, as it has been thousands of years since that day. Nal and Hirk were also mentioned in the Saga of the Vy'keen.