Are you talking about the one where manticores replaced witches? - it's not good. Shooting manticores are nonsense (they will be shooting at Erin's units) - I haven't seen this myself, to be honest, and witches shouldn't be removed (either the hydra or the rider should be removed).
I'm not talking about that mod; I'm a modder myself. I've personally created many mods, including ones with manticores.