Mental Prison

6th-Level Illusion
Casting Time: 1 action
Range: 60 feet
Components: S
Duration: (C) 1 minute

As in Xanathar's Guide to Everything with the following added:

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage of the initial effects increases by 1d10 for each slot level above 6th, and the damage of the secondary effect increases by 2d10 for each slot level above 6th.

Source: XGE 161

Changelog

Added upcasting option.