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So, regarding the planned changes:
1) There's an idea to remove "Triple Head Attack" from the fire hounds and give them "Armor Piercing" (ignoring 33% of defense upon attack, similar to "Empowered Shot" + something similar exists for Nargott).
2) Should we keep "Dive" for the war griffons or give them "Taunt" (as in Heroes of Might and Magic)?
3) "Purification": a) leave it for the adepts; b) give it to everyone; c) give it to upgrades; d) remove it from everyone.
4) We could also give "Purification" to the parasites to justify their name.
P.S. I personally don't understand how such powerful creatures as griffons can be defensive units.