Eiro looked at the two crystals float above his palm, reacting to every single of the Demon's thoughts. It was a concentrated mass of mana, meaning that it was a concentration of Eiro's will. At least for a few more moments.
The Demon drew a magic circle into the air, placing the two crystals into the center. Once it was activated, Eiro split his mouth in two and started muttering different chants in the ancient language. It was not the chant for this spell itself, but rather, he was trying to chant the essence of the ancient language to infuse it into the crystals. Slowly, as the spell was doing its job, another crystal formation started growing on the outside of the two crystals. Eiro was pulling his essence out of these two crystals, while stabilizing them with the ancient language.