Discussion about Sylvan (Wood Elves).

let's say there are 5 Druids; they will attack with magic more powerfully than themselves.
They also have the Stone Skin spell and a channel to transfer mana from the Druid to the hero.

Yes, Druids are useful as mages only when there are few of them, but in the final battle, a Druid will be a ranged attacker (of course, you can use magic to transfer mana, or when they are blocked).