This spreadsheet calculates the basic ratio of the amount of attackers that would be lost on average, for each defender killed.
It includes calculations for all of the following defensive bonuses:
* No modifiers
* Bunker
* Ammo Shortage
* Fortification
* Bunker + Fortification
* Ammo Shortage + Fortification
It combines each of these defensive modifiers with the following offensive modifiers to provide a matrix of ratios of dead attackers per defender:
* No Modifiers
* Enclave of the Bear Attack Bonus
* +1/+1 HQ Attack Modifier (Comeback Power)
* Mutant Faction attacking the Bringer of Nuclear Fire
* Mutant Offensive/Bodies Evolution Power
* Mutant Offensive/Bodies Evolution Power attacking Bringer of Nuclear Fire
The spreadsheet does not account for the use of missiles. I also can't guarantee that it deals with all possible modifiers, since I originally made this spreadsheet for only the modifiers present in my own game at the time of creation.
Any requests for improvement (or correction) can be PM'd to me and I'll do my best to update it.