Initially, Roy had taken this subspace as something similar to inter-spatial rings that could be created by alchemists.
During his fight with Carl, the son of Master Gray, when Carl was using all his strength to pull the runic item of his family out of the subspace but failed as the subspace sucked it in, Roy realized that it could be used in battle too to block attacks and even snatch weapons out of the opponent's hands.
And, just yesterday, following his command, it sucked in and fired back Trent's Ultimate.
That's when the thought that if it could absorb special attacks, maybe it could absorb spells struck Roy.
Roy smiled, "Putting this theory into practice was my best choice to date. This will become my new trump card."
He created and stored nine more Greater Fireballs in his subspace.
Just then, the system's notification rang in his ears.
『Your subspace is full!』
『Items can't be stored in it until you free its space!』
