Sprite Tune

is a spell developed by the Fairy during the Great War. When cast it creates a Spratul, or a spatial phase boundary. It is basically a pocket dimension within reality wherein only Fairies can access Spirit Circuits and therefore use magic. They use their souls/soul power to manipulate the space and have complete control over it.

Alternately, the Fairies can cast a Sprite Shade which will extend their territory and personal Spratuls over others and claim it. It's said they partook in turf wars over who could claim the most.

As a cliffhanger at the end of Volume 10, it was stated that Sprite Tune was cast and the Elkia Kingdom disappeared from the earth surface. In Volume 11, it's revealed this was cast by the enslaved Fairies of Elven Garde, but Foeniculum was able to cast another within it to commence the Matchmaking Game between 『 』 and friends. Afterwards, she cast a Sprite Shade to engulf Elven Garde's Spratul and free Ellkia.

With enough casters or soul power, one Sprite Tune can seal away a vast area of land, replacing its original position with a Spratul. The sealed area is then effectively trapped inside a Spratul.