035, Father of Modern Thaumaturgy

For Magicians, not every research result or every level of Mystery needed to be solidified into a Crest. It was true that the stronger a family's Magic Crest, the more powerful and diverse the magecraft it carried, but the human body often had its limits for ordinary Magicians.

In the early stages of transplantation, Magic Crests placed an enormous burden on the human body. This was why mage families, aside from true love, often prioritized carriers when producing the next generation. Descendants with poor aptitude for magecraft were not merely untalented in that regard; what worried Magicians more was their inability to inherit the Magic Crest in its entirety.

That was right. Just as Kiritsugu Emiya had inherited only a small portion of his father's Magic Crest, a Magic Crest itself could be divided. If a descendant's body could not bear the entire Crest, they had no choice but to painfully discard the magecraft that did not suit them or no longer needed to be passed down. For prestigious mage families, being able to learn most basic magecraft was merely the minimum passing grade. Thus, aside from the fundamental magecraft system passed down through the Magic Crest, most of what remained were relatively rare and unique magecraft techniques.

For example, El-Melloi's Vacuum Magecraft, or Rin Tohsaka's Gandr—

And even for a genius like Rin Tohsaka, inheriting an entire arm full of Magic Crests was practically the upper limit among Magicians. Crests were not Circuits; having them all over one's body was tantamount to suicide.

But now... that girl fighting Rimuru had them all over her body...

Even within those indifferent eyes, the light of Magic Crests faintly flickered.

What kind of monster is that?!

Yet Rimuru erupted with magical energy without the slightest fear. In an instant, the Magic Crest