Chain Amplification

You perform swift somatic gestures, forming intricate sigils in the air, amplifying the energy of a single-target evocation spell to strike additional targets within the area. Upon casting this spell, choose one single-target evocation spell that you are about to cast. When that spell hits its initial target, the energy arcs to other creatures of your choice within a 120-foot square area you can see. Roll 1d8 to determine how many additional targets are struck.

Each additional target must make a Wisdom saving throw. On a failed save, the target takes the same damage as the initial spell. On a successful save, the target takes half damage.