Nargott
Auto-translated
Alt Hydras don't have poison; these abilities function completely differently. The only thing that "resembles" it is regeneration.
Moving Griffons to tier 5 is less justified than moving Hydras to tier 6; you could say that Hydras on tier 5 is the most glaring mistake by the game designers. So, if you're going to start making changes, you should start with Hydras, not Griffons or Bears.
Regarding Centaurs, you could take a conservative approach and only swap them with Orcs (which are already close to tier 2), or you could be bolder and move them to tier 4 (Shamans to tier 3). Or even to tier 2. After all, a woman with knives is still a woman with knives, not the most combat-capable unit compared to Orcish brutes.
Moving Griffons to tier 5 is less justified than moving Hydras to tier 6; you could say that Hydras on tier 5 is the most glaring mistake by the game designers. So, if you're going to start making changes, you should start with Hydras, not Griffons or Bears.
Regarding Centaurs, you could take a conservative approach and only swap them with Orcs (which are already close to tier 2), or you could be bolder and move them to tier 4 (Shamans to tier 3). Or even to tier 2. After all, a woman with knives is still a woman with knives, not the most combat-capable unit compared to Orcish brutes.