Magic of Bonds.
In attempt to measure Lugh's magical potential, Dia gives him a Fahr stone, a special gemstone that can measure a person's magic capacity. Lugh's power is so vast, however, that the Fahr stone ends up exploding. This gives Lugh the idea of using Fahr stones as makeshift grenades. Over the following weeks, Dia and Lugh become emotionally attached to each other. Lugh proves to be an exceptionally fast learner, not only learning how to synthesize metals, but also how to create weapons. He and Dia even learn how to create new spells together, and on their last night together, he gives her a titanium knife as thanks for being his teacher, while she gives him her personal Fahr stone...
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