He generally strikes for three reasons. The first one is seeking profit, termed as slaying 'Pure Moonlight'; the second is determined by his mood, as he himself doesn't know when he might strike; the third is pretty simple and crude, purely due to an impulsive itch to show off.
"Pure Moonlight, what is it? What are the criteria to be your Pure Moonlight?" God Without Divine inquired.
He came to the Vast Wave Realm to find adversaries.
But he is someone who never pressures others, seeking fair fights instead.
During the last descent into the realm, in order to have a battle with a female divinity cultivator, he acceded to her requirements.
He retired with the female divinity cultivator in mountainous seclusion for fifty years, accompanying her daily playing the zither, practicing the sword and leading a life akin to deeply infatuated deities.
After fifty years, he was finally able to duel with the female cultivator.