Child of Misfortune
One of the most important things that Leo needs in this world is the Moon Stones and with his current status, getting his hands on even the low-level moon stones will be quite difficult and almost impossible.
The only thing he could do was to collect the Fragments of the Moon Stones and merge them into moon stones.
However, even in this case, there was a problem because if someone finds out that he was collecting large quantities of Fragments of the Moon Stones, they would tell something was amiss and become curious about it.
Therefore, Leo thought that if he could collect the Fragments of the Moon Stones in the name of his about to open a beast ranch, it wouldn't raise much suspicion.
Moreover, the other two sects have already opened a small beast ranch; however, since the Twilight Moon Sect was low on funds, Leo's predecessor removed the beast ranch.