Chains of cinder

Choose a creature that you can see within range. The target must succeed on a Strength saving throw or have the [condition]Restrained/condition] and [Prone] condition for the duration and take 1 d6 fire damage each of it's turns that it fails the save. At the end of each of its turns, the target repeats the save, ending the spell on itself on a success.

Using a Higher-Level Spell Slot. You can target one additional creature for each spell slot level above 5.