Warlock Bolt

A beam of crackling green energy lashes out from your fingertips the lightning stays on that creature and damages them for the duration. For the duration on the beginning of that creature's turn they take 1d12 lightning damage. If loss of concentration would end this spell the energy bursts for one last time doing 1d6 force damage.

At higher levels. When you cast this spell at 2nd level or higher, the continual damage that it does increases by 1d12 for each level above 1.