Dragon Lighting

Spell Name: "Dragon Lighting"   MP Cost: 1,000   Casting Time: 1 Action + Bonus Action   Concentration: False   Casting Method: Somatic   Range: Self (100-foot line)   Duration: Instantaneous   Spell Code: Unknown   Material Cost: a bit of fur and a rod of amber, crystal, or glass       A stroke of lightning forming a line of 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 10d20 lightning damage on a failed save, or half as much damage on a successful one.   The lightning ignites flammable objects in the area that aren’t being worn or carried.  

Upcast

  Master+ skilled mage can increase the damage to 8d10   MP Cost: 350