Maddening Darkness

8th-Level Evocation
Casting Time: 1 action
Range: 150 feet
Components: VM (a drop of pitch mixed with a drop of mercury)
Duration: (C) 10 minutes

As in Xanathar's Guide to Everything with the following added:
At Higher Levels. When you cast this spell using a spell slot of 9th level or higher, the damage increases by 1d8 for each slot level above 8th.

Source: XGE 160

Changelog