[Trigger] Trouble with bonus dmg and items

[Narutorendan]

Hello
Now I'm very confused, I explain first what I want to do :

I have :

Hero X 20 Strength; 0 Bonus Dmg
Enemy Y 40 Strength ; 10 Bonus Dmg

(Strenght = Power how ever or how ever)

Now :

• Event - A unit is attacked

• Condition - Attacking unit X

Then I want something like this :

• If Y Strength+Bonus > Strength X + Bonus then

• Set X strength + Bonus = Y Strenght + Bonus Dmg

So first of all I need something to save Strength + Bonus Dmg.
I thought about items but I realy don't have an idea how to go ahead with this.
I propably just need to know how to handle it with the Bonus Dmg.
I tried it with items, but I probably can't change the value of the Bonus Dmg of the item :/
Would be nice of you could help me