Lightning is a skill in the Heavenly Light skill tree of the Mage class.
Skill Description: Create a lightning in the sky to attack your enemy. Inflict x% of the magic attack on your enemy.
Required job: First Job
Required points: 0 points in Heavenly Light
Skill type: Attack Skill
Attribute: Climate
Attack type: Normal
Cool time: 8 seconds
MP Usage: 20 MP
Target: Monster
LevelBase Damage (x)
1 282%
2 309%
3 336%
4 363%
5 390%

Extremely powerful, if a little inefficient. Remember that you won't be able to spam it. If you want high damage though, this is the one to max. Has an instant cast, very useful for instant damage.