5. Chain Lightning is a skill what is not so bad, but the other damage skills are just better. Thats why its the best as 5th master. The higher chain is, the more target it hits. But the direct damage at one target is very low in comparison to lance... and using chain in a wrong moment can be ur death (when it lures 1 mob too much), its sometimes too uncontrolable...
Chain Lightning is very good when it comes to guildwars, but I would not skill only for guildwars, when you think about how often you have it... I never regret it, that chain will be my 5th master and not earlier..

6. Natures Enchantment: For me its the least effective skill of a lightning mage. What does it give on P? 60 AP or something like that... thats annoying when you compare it with hs or aura. The AP even has no effects on the skills, and the mage makes best damage with the skills... This skill is only good for full-lightning buffers, and there are not many... the only use for it is for farming metins or to buff someone with poly... its more effectiv for others then for yourself! The other skills are just more usefull in nearly every situation... thats why i never have any point on it...

Every skill can have 1 point, only natures enchantment has no worth for any point...
The order of the skills are made out of my experience. Thats always a choice that belongs to yourself if you follow it or not...

How to use the skills?

PvM: At first when you have only strike as master, lure everything together. It can be a bit more then you can handle. But RUN! Run a bit, make a strike into the group of monster or any other skill, run again and so on... when the mobs are almost dead u can make the rest with ur bell or fan...

PvP: Best is to start with a lance at your target, directly following a strike. when you have speed mastered it does not take long that you can use another lance after strike. or use blessings when its necessary, but then lance should be ready again for use...
Just make lance first before strike, and not the other way around 
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