Lightning (Su): A herd cloud can generate bolts of lightning. Twice per day it can produce two 400-foot lines of lightning, each dealing 6d6 points of electricity damage. These "twinned" lightning bolts cannot overlap. Once per day a herd cloud can produce a lightning bolt that strikes a target within 400 feet for 9d6 points of electricity damage and then forks out to hit all targets within 30 feet of the initial target for 4d6 electricity damage, in a similar fashion to a chain lightning spell. A DC 22 Reflex save halves the damage of any bolt. The save DCs are Constitution-based.