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You can try changing the ID of the witches in the city buildings as well, shifting them to the fifth one (both for the building and the level). In a level 6 city building, add the ID of hydras, which will then be replaced by manticores.
You can certainly try it, but it won't affect Erin's specialization – the level 6 creatures will continue to shoot (and if they aren't ranged units, it will look strange :cool:).