Unopening Red Room

Spatial Creation Magic: Unopening Red Room (空間創成魔法『開かずの赤い部屋』) is a space-based Creation Magic spell.

Description
With an open grimoire, the user slams their hands on the ground and sends of wave of magic at a target. Upon contact, the target is teleported into a large red cube. The only means of escape is defeating the user of the spell.