After the birth of the Summoning, Luke could no longer sleep through that night. The little feline was very energetic and loved to play, and soon Atom became a victim of his mischief. While the Summoning ran and tried to grab the horse's hooves, Atom tried not to step on him, while running away in fear.
When Luke learned to omit the Summoning, the horse finally found peace. The process of invoking the little lion and omitting him was as simple as evoking the Behemoth Axe; in other words, Luke only needed to make the order with his thought.
At one point, while Luke was watching the summoning play in the water of a small stream after coming down the hill they were on, a name came to his mind: Bastet. This was the name of a Cat God, who was in a fable that Matthew often read. Since the Summoning didn't have a name yet and Luke thought the name Bastet was very beautiful, he just named the little lion like that, and they went on their way.