Which units would you replace in the Sylvan castle?

Ents absolutely cannot be removed! They are purely elven. Elves and ents, ents and elves, only ents for the elves! Don't remove them. But druids, in my opinion, are not essential. Instead of them, you could put some werewolves, for example. TO "Player": it's written, "imho, no need to throw stones!"