Every High-ranking Demon could possess only one set of Devil Chess Pieces. In the Underworld, many matters concerning Demons, including their status and standing, were decided through Rating Games.
Thus, for many High-ranking Demons, the strength and potential of their servants were matters of utmost concern.
Some High-ranking Demons treated their servants purely as tools, considering only their strength while completely disregarding everything else.
Others, like Rias and Sona, regarded their servants as family. When choosing servants, they considered not only potential, but also character and conduct.
Before deciding to make Seiya her servant, Sona had also observed him for some time before making her decision after careful consideration.
Among the ordinary students of Koma Academy, Seiya was exceptionally outstanding. However, compared to exorcists like Shinra Tsubaki, he was not particularly remarkable.
Therefore, Sona had initially intended to make Seiya a Pawn.
However, when she tried to use a Pawn Devil Chess Piece to reincarnate Seiya as a Demon, she received a message in her mind that the piece's magical power value was insufficient.
Afterward, she tried a Knight and a Bishop, each worth roughly three Pawns. Yet the magical power was still insufficient, and she ultimately had to use a Rook piece to barely turn Seiya into a Demon.
An ordinary human could not possibly require a Rook worth five Pawns.
This had led Sona to suspect that Seiya might be a Sacred Gear wielder, or that he might not be an ordinary human at all.
Mixed blood from other races, descendants of heroes, and similar circumstances could all increase a servant's potential and value. Sona had been wondering which of these possibilities applied to Seiya.
It was only after hearing Seiya's own answer that Sona revealed a delighted expression.
If it was a Sacred Gear that had increased