Twilight was merely an organization under Sterl that helped him manage resources. The moral character of its members, whether they would betray him for personal gain, was of no concern!
Thus, even if those members from level-seven guilds betrayed their original guilds, Sterl didn't mind.
He was solely focused on the struggle for control over the Hall of Valor.
Sterl summoned a panel.
It was the manipulation permissions for the Heavenly Curtain Canyon.
Thanks to the information he received from Sosia, Sterl felt that messages were subtly emanating from the Heavenly Curtain Canyon.
[Hint: You have triggered a hidden main quest (Hall of Valor region): Master the Power of Creation!]