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The sixth upgrade didn't impress me. The stats are weak. But after the upgrade...
I haven't played with them much, but it seems like this is an upgrade you can postpone. It gives some minor bonuses, like a lightning spell and a couple of attack and defense points, but it's quite expensive. The damage is small, but the lightning spell effectively doubles the damage on hit, so it's quite decent...
Тьма - это то, что позволяет смертным не забывать, как ярок бывает свет.