No bone in Leon's body was considered ordinary. Unlike most other beings, his bones were heavily fortified by his Divine Power and could be considered top grade materials to forge Divine weapons. By forming a bone sword that was made from his own bones, he was effectively creating a powerful Divine Weapon that could keep up with the stresses of battle at his level.
When Darth heard Leon's condescending words, an aura tainted with darkness and rage seeped out of him and throbbed in the surrounding atmosphere, contesting against Leon's own aura. Leon was a bit more intrigued when he found that Darth's aura was able to compete with his.
'Of course, none of the Gods in the Army of Destruction are normal. I'm certain they are powerhouses, even at the Minor God level.' He thought to himself and prepared to fight.