I like BlackSlys suggestion, frontlaoding the damage.
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3) Lightning Storm is on a pretty long recharge, and supposedly balanced around doing close to its full damage, yet its fire rate is too slow to make it worth the End cost in anything but a boss/AV fight. Would you be willing to lower its End cost by about 20% so that it's not a waste to summon it for other fights, and also to give it an "alpha strike" capability by giving it a 1-use Chain Induction attack when its first summoned? That way its overall long-term DPS will hardly be affected, but it will become more useful when summoned for a single small fight.
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