The World's Decisive-Battle Magecraft

Nowadays, Luo Zhen possessed both vast knowledge of sorcery and an immense amount of knowledge of magecraft. His attainments in all kinds of thaumaturgical formulas could be called unparalleled in the world. Judging solely by the breadth of his knowledge and the number and variety of his formulas, let alone modern Magi, even the Magi of the Age of Gods could not compare with Luo Zhen.

Therefore, Luo Zhen naturally knew exactly why his Heroic Spirit Summoning kept failing.

The catalyst issue Scathach had mentioned was certainly one factor.

Without a catalyst, Heroic Spirit Summoning would only summon the Servant with the best compatibility with the Master. The process was highly random, and the magus himself had no way to summon a specific Servant, much less gradually summon Servants from weak to strong according to his own abilities. Thus, if the target of the summoning was too powerful, failure was only natural.

On top of that, the issue of magical energy was indeed extremely severe, and Luo Zhen had no solution for it either.

Generally speaking, summoning a Servant required a complex magecraft ritual. It was a mystery beyond human capability, and only the Holy Grail's assistance could make it possible. The summoning itself was carried out by the Holy Grail; otherwise, humans could never conduct a ritual on such a massive scale.

Through technology from various fields, Chaldea had systematized Servant summoning. Yet even so, the Heroic Spirit Summoning System remained incomplete. To date, there had been only three successful cases. One person had gone missing, another could only become a Pseudo-Servant, and only Da Vinci's summoning had truly succeeded, proving that the system was still immature.

That was why Luo Zhen had never used Chaldea's Heroic Spirit Summoning System to summon a second contracted Servant.

"Although, after obtaining