Not sure if some of you realized this (I didn't at first) but you don't need to upgrade sequentially.
For lightning, I prefer the upgrades that do reliable damage rather than a chance for damage. I struggle to find a use for the Electrical Discharge upgrade. I don't need to cherry pick in a mob, and it's only 25% chance of being AOE. Against the lone end-level boss, it's pointless. I can spend that skill point a lot better.
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