Desire is one of many things that make the world run.

[Rin sticks her pinky in the book to serve as a bookmark for the Hercules page to search for a few others.]

I've also encountered this person [Medusa the Gorgon] as the Rider class Servant, and... [flipping, flipping; this section likely isn't as long as the other two, whose names have great renown:] This woman, as Caster.

[Princess Medea, hailed as a witch. Rin's eyes are notably glassier referring to her page, though she didn't look particularly happy on Medusa's either.]