When Abner first captured Margaret, the Red Saintess, he planted a hidden Suggestion in her mind. Otherwise, the Owen Avatar could never have Hypnotized a Sequence 3 Demoness of Unaging so easily.
If he really had that kind of power, the Blue Saintess and the White Saintess would not have escaped either.
Besides, the Hypnosis was far from secure. Margaret could break through the shackles in her mind at any moment and regain control of herself.
That was why Abner needed a Secret Art to turn her into his devout believer for good, so she could atone for her sins through her actions in the future.
As a Demoness, Margaret naturally had no such intention. She needed a little outside pressure to push her along... Ahem, namely, tasks from her "master."
Wait. Does that make me the villain? Some "protagonist" isn't going to rescue Margaret and come after me for revenge someday, is he?
As he mocked himself inwardly, Abner pressed his palm, radiant with sunlight, against the Red Saintess's forehead.
The confusion faded from Margaret's eyes, replaced by joy, gratitude, and peace... Then, following the information she had just received, she devoutly recited:
"An ignorant traveler from the Unknown;
"Blessed by Evernight, the Moon, Knowledge, and the Lord of Mysteries;
"Emissary of the All-Seeing Eye and the White Angel;
"The Hero Detective of Backlund;
"The erudite Abner Brain.
"I pray to become your believer. I pray to become one of your blessed..."
The first five lines of the incantation were the Honorific Name Abner had devised for himself after advancing to Sequence 3. Though he had borrowed the Pure White Eye and Gods to elevate his status, the name ultimately pointed to Abner himself. It was unlike the Mechanical Emperor's three-part Honorific Name, which actually pointed to an imprint