Dragon Necro Blaster

A skeletal dragon head is created from its mouth spawns, beam of crackling blue energy that lances out toward a creature within range, forming a sustained arc of lightning between you and the target. Make a ranged spell attack against that creature. On a hit, the target takes 1d12 lightning damage, and on each of your turns for the duration, you can use your action to deal 1d12 lightning damage and 1d12 force damage to the target automatically. The spell ends if you use your action to do anything else. The victim must make a 15 DEX check in order to escape.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the initial damage increases by 1d12 for each slot level above 1st.