Chain Lightning fires on channel tick. On a piece that carries it it reads: Every {count}th beam pulse that lands chains lightning to the 2 nearest other enemies for {value}% of the pulse.

Word for word it is Every {count}th beam pulse that lands chains lightning to the 2 nearest other enemies for {value}% of the pulse, and the number in it grows with the gear: 120 to start, 6 more for every item level, and it only goes off every 10 times you set it up.

0 bases carry it.