The Keragulus had a calm expression on its face, but its straight gaze and smile seemed very piercing and unnerving. Despite Gomez's attempt to command it, it appeared to be acting independently.
Summoning sorcery was a very powerful branch of sorcery that allowed the summoner to open an interdimensional summoning portal to allow an extra-terrestrial being or entity to enter the summoner's world. It was a rare sorcery which required talent and knowledge but after several centuries of accumulation, sorcerers had managed to create magic scrolls that could allow one to perform a summoning in a limited yet effective fashion.
The Demonic Summoning scroll that was given to Gomez by Great Sorcerer Phelan was such. It allowed one to summon a demonic being with a power limited to the early First Rank, yet there were limitations that came with its use.