Dia

     You fire a crackling beam of blue light from your hand to a target creature in range. Creatures hit suffer 3d10 force damage and the beam arcs to another target within 25ft of the original target and the caster makes another attack roll. The spell continues jumping between enemy creatures until it misses or there are no other creatures within a 25ft range. Creatures hit by this spell can't have the spell arc back and hit them multiple times in one round.  Any undead hit by this spell are considered vulnerable and take double damage and immediately fall prone. The beam is bright enough to light fully light an area of 25ft around the caster and each target.