Celestial Loophole
Anna arrived at the foreboding place where the older generations of angelic hybrids were sealed. The Electric One turned to the rituals within her Angel Tablet set, and found the appropriate one. To her existential surprise, she learned that it required a certain amount of angelic grace.
The former human female did not want to use even a small portion of her own grace, and she did not want to borrow from another of her celestial kind. She exhausted the possibilities before settling on the most reassuring one: traces of angelic graces lingering within physical vessels as a result of peaceful angelic departures. No non-primordial angel who departed peacefully from a vessel could avoid leaving behind a trace of grace. However, the saving grace of this residual side-effect was that the remaining grace within an angel could regenerate over a period of time.
Even more possibilities presented themselves before the highly ambitious angel. Although it was forbidden for angels to remove, voluntarily, even a small portion of their grace, there existed no rule which prevented them from changing vessels frequently, even for the purpose of extracting and utilizing a similar amount. Should sufficient numbers of angels in either the human-friendly Commonwealth of Heaven or the independent Republic of Heaven resort to this celestial loophole, the potential for extracted grace amounts would be immeasurable, even by angelic standards. Neither celestial realm would run out of grace amounts to utilize in rituals that required them, including rituals meant for all-out celestial warfare.
For now, Anna returned her attention towards summoning sufficient numbers of vessels which had experienced peaceful departures of angels. No matter their disparate original locations within Creation, the Electric One sent the desired vessels into a deep sleep, then summoned them instantaneously with a gesture of her hand. Hastily, she went to work and extracted the traces of angelic graces from them, before returning them to where they once were.
Having completed that work, the former human female was now ready to release the sealed angelic hybrids.