Comet Azur

You channel a beam of pure arcane energy in a 5-foot-wide, 60-foot-long line until the spell ends. When the beam appears, a Strength saving throw. On a failed save, a creature takes 12d4 Force damage and has the prone condition. On a successful save, it takes half as much damage only. A creature also makes this save when it enters the spell’s area for the first time on a turn or ends its turn there. A creature makes this save only once per turn.

Until the spell ends, your speed is reduced to 0, but you can take a action to move yourself and the line up to 10 feet in any direction.

Using a Higher-Level Spell Slot. The damage increases by 2d4 for each spell slot level above 6.