Chain Lightning A5E
6th-level evocation
You fire a bolt of electricity at the primary target that deals 10d8 lightning damage. Electricity arcs to up to 3 additional targets you choose that are within 30 feet of the primary target.
At higher levels
An extra arc leaps from the primary target to an additional target for each slot level above 6th.
Other versions
Source: Adventurer's Guide (EN Publishing) · License: Creative Commons Attribution 4.0 / OPEN GAME LICENSE Version 1.0a details