Hurls a lightning bolt at the enemy, dealing X to Y Nature damage and then jumping to additional nearby enemies. Each jump reduces the damage by 30%. Affects 3 total targets.
Chain Lightning's initial hit deals 100% of the damage, its second hit 70% and its third hit 40%. In total, Chain Lightning can do up to 210% of its damage.
Chain Lightning's initial hit receives 71% of your spell damage. It is not affected by any AoE reduction.
All three hits are calculated individually. As such, it possible (and fairly common) that only one or two hits critically hit.
Unlike [Lightning Bolt], Chain Lightning has no projectile animation; instead, it instantly hits all targets.
Tips and tactics
Chain Lightning has a fairly high chance of triggering [Elemental Focus]. Due to Chain Lightning's high mana cost, it also benefits well from it.
With [Elemental Mastery], all three hits are guaranteed to be critical hits. In combination with [The Lightning Capacitor], this automatically grants you an additional Lightning Bolt hit.
Past changes
In Patch 2.3, cast time was reduced to 2.0 (from 2.5), mana costs reduced, benefit from spell damage reduced appropriately.
[Convection], 
[Concussion], 
[Call of Thunder], 
[Storm Reach], 
[Elemental Focus], 
[Elemental Fury], Elemental Precision, 
[Elemental Mastery], 
[Lightning Mastery], 
[Lightning Overload], 
[Stormstrike], 
[Nature's Guidance], 
[Tidal Mastery], 
[Nature's Swiftness], 
[Nature's Blessing]
8
[Lightning Bolt], Chain Lightning has no projectile animation; instead, it instantly hits all targets.
