myav
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In my opinion... if we're talking about strength.
8: 3rd upgrade of level 7 units from all castles + a mythical creature.
8.1: Rusty
8.2: Crystalline
8.3: Dracolich
8.4: Azure
8.5: The Commander will crush everyone.
8.6: New monsters that are script-based powerhouses.
P.S.: Occasionally, an upgraded cow can be stronger than all the others.