If not for the need to fight now, Shard would have planned to find a way to call Iluna to the scene, then borrow the powers of an Angel and a Demon from Priest Augustus and Dr. Schneider before the battle, and additionally borrow a few relics specifically to restrain Angels from Miss Danester, the Academy Librarian—these kinds of relics do exist, and finally, have Sister Delphine lend her Angel-Level Relic Longsword, "Ashes."
At that time, with the powers of both Angel and Demon, Iluna's "Balance" suppressing the Angel, relics providing power, and two Angel-Level Relic Longswords in hand, Shard would have seventy to eighty percent confidence in defeating the opponent without using Divinity.
"The venue is this Island Heart Lake, and you are not allowed to leave its boundaries."
The white-robed lady said, then waved her hand at Professor Drake, who vanished on the lake surface.