Cassians' Amplify Gravity

You point at one creature you can see within range, a dull purple energy encompasses it for a moment. The target must succeed on a Constitution saving throw or take 1d8 force damage and its speed is halved until the end of its next turn.

The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).