This spell creates an electrical discharge that begins as a single stroke commencing from your fingertips. Unlike
lightning bolt,
chain lightning strikes one object or creature initially, then arcs to other
targets.
The bolt deals 1d6 points of electricity
damage per
caster level (maximum 20d6) to the primary target. After it strikes, lightning can arc to a number of secondary
targets equal to your
caster level (maximum 20). The secondary bolts each strike one target and deal half as much
damage as the primary one did (rounded down).
Each target can attempt a Reflex
saving throw for half
damage. You choose secondary
targets as you like, but they must all be within 30 feet of the primary target, and no target can be struck more than once. You can choose to affect fewer secondary
targets than the maximum.