MOD: Armageddon's Blade

There's probably a formula with rounding involved, and it would be enough to just display the formula (in the classic form: "for every X units of knowledge, starting from Y, it gives Z of something").
The ultimate solution would be a dropdown list or a counter. I don't know how to do that, though.
By the way, I once made something similar to add information about the elements of various units (for the Warlock). I faced the problem of where to place the third button nicely in the interface, alongside the existing two (Necro and Fury)...