Go 1S of Chiron and get boulder (it's part of the room, not on the ground). Go 2E from Mount Apesas and drop boulder, or else the lion will flee from you. Go WNE and choke the <a href="http://www.legendmud.info/mob?id=197">Nemean Lion</a> to death. He is invulnerable to weapons, so just go wary 3 for the fight. You may flee to heal up, if needed.
Once he's dead, you can take his head to Chiron for the scalp, and the hide for leggings.