Originally Posted by
Kotonoha
After nearly 900 years of effort, Justeaze - the homunculus who would come to be called the Winter Saint - was forged.
She was a model that strayed from what the magi had intended, created completely by accident, but her abilities were equal to or above those of their master.
The magi should have been elated about Justeaze, but they couldn't be happy. After all, she was a mutation that was born regardless of their own techniques or skills.
Even if that specimen was to reproduce the third magic, that conclusion would be harder for them to bear than 900 years of failure.
The magi deperately attempted to create a homunculus that excelled Justeaze by their own techniques.
The artificial intelligence created to act as the castle's central management - the golem Jubstacheit - was the pinnacle of their craft, and became the father of all homunculi created at Einzbern.
Justeaze succeeded at proving the third magic.
However, it was not cost-effective. Justeaze's use of the third magic was like careful knitting. It would take several years to save just one person, making the salvation of the entire human race virtually unattainable.
In addition, while Justeaze herself did not age, her body was so frail it would take little to kill her, so she could not leave the castle.
Since her intelligence and mentality were also unaging, she did not develop at all. From an outside perspective, it was as if she was repeating a single day for all eternity.
If she were to leave the castle she would be freed from this "single day", but the act of leaving the castle signified an easy death for Justeaze.
In the end, they accepted that humans could create something that surpassed humans, but not something that could save humans.
...Or perhaps they would not have failed if a miracle like Justeaze had not occurred.