I want to make an autocast ability (e.g. using Searing Arrows as a start) that burns enemy mana with each attack. So when activated, in addition to the normal hit damage, burns away a portion of enemy mana. I want that portion to be equal to a % of the damage dealt by attacking. The ammount isn't important, I can change it myself. So basically, an active feedback ability which can be used in autocast and doesn't always burn a specific ammount of mana, but a percentage of your attack damage. That percentage will increase with each level. Any help would be appreciated. Thanks in advance.