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That upgrade value is used in a weird way. You seem to be missing my point completely. For the player who will see the armor value jump from 0.4...
Ok. So that's how it works. That's still not a 20% increase in armor.
If the base armor value is greater than 1, the upgrades lower the value.
If the value jumps from 0.4 to 0.5, that's a 25% increase.
20% of 0.40 is 0.08 so the Sparabara champion is weaker than before. It should be 25%.