I stopped using the whole patent, now that I have access to all troops that I need, I kinda find it useless. The Shark's Tooth that the first hireling gave me gives +5% XP and Gold, as opposed to +3%, so I switched it.
Why? Well, it cost about 700-800 Gold AND Trophies to upgrade 10 Guardsmen to 2 Paladins. And I had to fight a LOT of battles to accumulate this many.
So, I think, apart from the early game where you don't have access to some units, or in cases where certain units are simply not available anywhere, this system is usefull, but overall, I'd have been happier with a system more like the Necromancer in the Dwarven lands is offering.
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