The artifacts she was fusing had been the foundation of her strength for a long time now.
The Phantom Core Extractor allowed her to extract the soul or spirit of a recently slain being. It was a powerful ability, but it had its limits. The success rate dropped by ten percent for every level the target was above her.
In theory, that made it unreliable against stronger enemies.
In practice… it had never failed her.
Isaac suspected it had something to do with her bloodline.
The second weakness was more dangerous. Extracted spirits weren't guaranteed to obey her. In fact, they could turn on her at any moment.
That was where the Celestial Spirit Pact Token came in.
It allowed her to form a permanent bond with spirit-type beings. Once bonded, they couldn't harm her.
Of course, the target had to agree first.
