(inspired by the rune dragon and venator bow)
A new spell that offers arch damage that jumps from one target to another and another deals most damage to the primary and reduces damage as it bounces off each target maxed at 3 like the venator bow and with a small chance to stun.
And a single target strike that offers slightly more damage with a higher chance of stunning.
Maybe even a new rune to go with it.
(Storm rune) ( arch rune) ( static rune)
A new mini quest could be a potentially fun way to introduce this.
A combination of cosmic + nature + steam + death rune to create it or just a new unique way to make it altogether.