[Gilgamesh quietly registers Hermione under the ever esteemed category of adequate sources for emergency mana. Also known as: food. Continuing to smile with all pleasantness, he lets go.]

A worthy field of study, yes, among the many that exist.

[To the poster, he gives a knock, knock with those same fingers. A golden glow surrounds its edges, and its surface sparkles with a fine sheen. He looks pleased with his work, beginning to read its fine print.]

Now, let us see... one gold coin for services rendered... these compasses look useful. What of those?