Conductivity( Unearthed Arcana, p. 92)
You have crude control over electricity effects near you.
Exposure to call lightning, lightning bolt, or chain lightning spell,
Whenever you take damage from an electricity effect, you may send a line of electricity arcing from your body at any single target within 30 feet. This bolt deals half the damage you just took; a Refl ex save (DC 16 + your Cha modifi er) halves this damage.