Nargott
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Actually, these units have been re-tiered a long time ago, as well as some others:
Monks - tier 4
Knights - tier 5
Griffins - tier 6
Bone Throwers - tier 3
Bears - tier 4
Witches - tier 5
Hydras - tier 6
Orcs - tier 2
Shamans - tier 3
Centaurs - tier 4
Succubi - tier 3
Cerberuses - tier 4