electric overflow

you invoke the energy from the weave itself casting what would be a ragular lightning based spell, although you intentionally cast it with a too low spellslot causing it to go haywire.

everything within 100 feet in front of you and 5 feet within any other direction must succeed on a dexterity saving throw or take 7d8 lightning damage. damage is halfed on a successful save.

at higher levels. if the spell is cast at a level above 5th the damage die will increase by 1d8 for every level above 5th.