Yakshaveer Hanumat

Hanuman encounters a greedy Yaksharaj in the Yakshalok. Urvashi and Rishi Muni are in the captivity of Mayavi Yaksharaj and he wants to free them from his captivity. Later, Hanuman defeats Yaksharaj but Rishi Muni warns Hanuman to not kill him. Want to know why Rishi Muni warned Hanuman? Will Yaksharaj get a Jeevandaan?