Damage calculator.

The Curse spell is not properly implemented. When activated, it causes the calculator to crash.
Also, the Bless spell doesn't work correctly on combat units (damage is reduced to a minimum).
Otherwise, the work is excellent.

I didn't touch the spells at all. Regarding Curse: if there are heroes on both sides, there won't be a crash; this seems to be an old bug. I will fix the spells for the units, and I will fix this as well. Thanks for reporting the bugs!