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the most dangerous griffons belong to Iris...
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regarding Battle Griffons... I agree. They are good in defense
Added after 1 hour
upgrade Readiness and Counterattack for Iris... Battle Griffons become simply monsters...
(as do Royal Griffons, by the way)
Added after 3 minutes
the trick with Battle Griffons is Battle Frenzy... the more you hit them, the stronger their counterattack (each subsequent counterattack is 1.5 times stronger than the previous one... and so on until their turn comes)