The homunculus shook his head. The surrounding area was obviously criss-crossed with thaumaturgical traps and boundaries. They would be little trouble for a Servant, but that was not the case with the homunculus; it would take less than ten minutes for them to do away with this defective product, for whom any use of thaumaturgy would bring it to death's door. However, Astolfo was filled with confidence as he chuckled.

"That's why I have this. Tadaaaaa!"

He took out a thick, leather-bound book. The words and shapes on its cover were subdued and rather unremarkable, but even the homunculus could tell that it was related to thaumaturgy.

"A long time ago, I was saved by the lady Logistilla. She gave me this then. Just possessing it lets me break through any sort of thaumaturgy!"

- Vol 1 Chapter 4