How your Offense Level is calculated
Level Calculation For calculating the Offense Level of your army, the value of every unit is considered and transferred into an arbitrary score. That score is based on the level, its Army Point Cost ...
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The code is actually much more simple, as it's simply a weighted average based on cost size plus some "magic fairy dust". Since I didn't need the magic dust at the time I never reversed parsed it, thanks for making me want to to do that now.
