Time Loop

You attempt to send one creature that you can see within range to another dimension inside the crystal prism used for the spell.  The dimension is of  your creation and any creature sent there is caught in a time loop, repeatedly reliving the same day. The target must succeed on a Charisma saving throw or be teleported to a random location inside the time looped dimension. While affected by this spell, the creature doesn't need to breathe, eat, or drink, and it doesn't age. Also, the creature inside the crystal prism can't leave it by magical or nonmagical means. If the creature tries to use teleportation or interplanar travel to leave the prism, they waste the use of the spell or effect. The crystal prism also extends into the Ethereal Plane, blocking ethereal travel. Every 24 hours a creature can repeat the saving throw, the creature is released and the spell ends on a success.

A Dispell Magic spell can end the spell only if it is cast as a 8th-level spell or higher, targeting  the crystal prism component used to create it.

You can use a particular crystal prism to create only one time loop at a time.  If you cast the spell again using the same material component, the target of the first casting is immediately freed from its looped dimension.