Conductive Resonance

A line of nearly intangible sparks flies towards the target up to 120 feet away. Make a ranged spell attack. On hit deal 2d12 lightning damage. While concentration and line of sight is maintained, they take an additional 1d8 lightning and 1d8 thunder damage each time they receive lightning or thunder damage. Each activation of this ability is audible to all creatures within 300 feet.

At Higher Levels. At level 11 the triggered thunder damage increases to 3d8. At level 16, the initial damage increases to 4d12.