Bolt Crash

You launch yourself like a living bolt of lightning, becoming a streak of crackling energy that tears across the battlefield before detonating in a thunderous impact.

When you cast this spell, you fly up to 30 feet in a straight line without provoking opportunity attacks. Your movement is so fast you pass through enemy spaces. Any being you pass through takes 4d8 Lightning damage. (dex save of 16 for half damage). 

At the end (Impact Zone) any creature in a 10ft radius makes a dc18 dexterity saving throw or takes 2d10 lightning and force damage. (no force damage on a save).

1d8 - 1d10 per level above 5th