Review Detail of Thinkerr in Trial of Monsters and Summons

Yes, but each successive monster requires more concentration to keep summoner. Think of it like a finite amount of energy that can grow from regular use and increase from monster evolutions. Factors like intelligence of summons and their willingness to obey their summoner also affect these things. Most can only reliably summon one or two summons at a time, 3 or 4 tends to be the limit for advanced summoners. Monsters capable of independent thought reduce amount of attention needed