[Greater Summoning Magic] was a B-Tier Skill that Rey got thanks to his [Merger].
He combined the effects of [Summoning Magic] that he learned back when he and his classmates were training in the colosseum.
Back then, the Summoners used [Summon], which was a C-Tier Skill—albeit rare.
The Monsters they could summon at a time were weaker, and their numbers weren't too impressive.
'Then, a few days ago, when Lucielle and Brutus were leaving for the battlefield, she used [Summoning Magic] to summon a giant flying creature that resembled a massive bird.'
Since Rey and his classmates saw them off, he was also able to mimic her Skill.
Afterward, he merged the both of them together to birth this new Skill of his.
'Hehehe…!'
Rey was grinning like an idiot under his mask as he stared at his enamored audience.