Tasha's Caustic Brew - Lightning Transmuted

Tasha's Galvanic Discharge 

A stream of lightning emanates from you in a line 30 feet long and 5 feet wide in a direction you choose. Each creature in the line must succeed on a Dexterity saving throw or be covered in writhing electricity for the spell’s duration or until a creature grounds the electricity by lying prone for its movement phase. Any creature covered in the electricity take 2d8 lightning damage if it comes within 10ft of another also affected as lightning flashes between them.

Usage of this spell consumes one sorcery point

At Higher Levels. A side-effect of spell transmutation is that spells cannot be cast at higher levels