Sorry, im not so sure about the AoE, as i cant seem to find out how to do that, but for the range, damage, and AS, its quite easy. Create a new upgrade, base it off anything, i did mine on the Human Skill "Iron Forged Swords"
Then, the things you will need to change are "Data - Effect", for the first one, make it "Attack Damage Bonus", The second one will be "Attack Range Bonus", Third "Attack Speed Bonus (%)". Change the base to what you want, the the increment is how much each upgrade will add. Change the name and icon to what you want, along with the gold invalid and such.
It seems that all the upgrades, that add an ability such as AoE, or even abolish magic. Dont have anything listed, its just blank..which they may be done by a built in trigger, if thats so, i dont know how to make an Aoe one, so someone else will have to help you with that, sorry.
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