One more time again here. Game is pretty good thats why i went back. Today i tried vampire and it was fun but the tooltip what exactly passive do is little bit confusing from the start. From my prespective it says its gona do 8 dmg by clicking enemy, but its not the case - it gives two dmg sometimes just one dmg to the enemy. I did not get it how it exactly work. Would consider better info about that, or maybe its just my problem...
I hope that by the end of the week I will make a tutorial:(
This is not a passive ability, but an active one. The cost of 5 mana will cause damage to all visible enemies equal to the amount of current power (in your version it is 8).
The passive ability is damage when tapping on an enemy (if you tap on the same enemy, the damage increases by +1).