The Kingdom's summoning arts... or rather, the summoning arts in today's magical system, are often viewed as an outdated and impractical spell.
Because summoning arts are only applicable to powerful magical creatures.
This well-known flaw makes summoning arts shelved by spellcasters, with little discussion and research, and it has never been popular among various spell factions.
It's not that the kingdom's mages don't understand the potential of summoning arts. In fact, even an illiterate farmer knows how powerful it is to call upon ten helpers with a wave of the arm.
Imagine, when adventurers delve deep into the tomb of an ancient deity, trapped in the depths of the earth, and suddenly the surrounding coffins burst open with a bang, the coffin lids fly high, and in the dust emerge a dozen dragon priests—fallen mages who serve an ancient evil dragon and have transformed into liches.
