Just wanted to hijack this 3 month old post in the hopes you can answer my very noobish question.
If an item has +10% increased lightning damage but I'm not using anything with lightning damage to begin with, is it adding lighting damage itself or only increasing what's already there, which in my case, is nothing?
Again, apologies for this but I am a dumb.
Try to take everything super literal. So 10% increased lightning damage, increases your lightning damage by 10%.