Widogast's Web of Fire

You strike both palms against a solid surface, releasing five streaks of flame that race toward one or more creatures you can see within range. Assign each streak to a target. A streak must be able to trace an unobstructed path along solid surfaces from your space to a point within 10 feet of its target. It can climb vertical surfaces and cross an obstacle or gap no more than 5 feet high or wide, but it can't pass through Total Cover. Flammable objects along the streaks' paths that aren’t being worn or carried ignite.

Each target must make a Dexterity saving throw. On a failed save, a target takes 2d6 Fire damage for each streak assigned to it. On a successful save, it takes half as much damage.

If all the streaks are assigned to the same target, that target takes an additional 2d6 Fire damage.

Using a Higher-Level Spell Slot. You create one additional streak for each spell slot level above 4.