They had long known that the mages were extremely selfish—
Just like when Star Antimony attacked, they surrendered immediately; and when Star Antimony was failing, Black Hawk contacted them, and they easily teamed up. Because of this, the Sons of the Moon were convinced that the mages would never perish with Star Antimony, thus they reached out to these selfish Wise Men, hoping to gain their Wisdom.
The plan succeeded in part—they indeed did not want to help Star Antimony.
But also failed in part—they didn't want to help the Sons of the Moon either.
At this moment, those Sons of the Moon who had gone missing after participating in the Fallen Celestial Marshal war sent letters to their families and friends, or visited them in person... They offered an alternative: transform into a Fog Demon.
