You can purchase Euphonium Unbound: Soaring or Euphonium Unbound: Winding from your Realm Depot: Riches of the Realm.
Tip #2
Open Editing Mode to place Euphonium Unbound: Winding indoors or Euphonium Unbound: Soaring outdoors.
Tip #3
Interact with Euphonium Unbound: Soaring or Euphonium Unbound: Winding to open the Realm's music menu, where you can then consume Radiant Spincrystals to unlock the corresponding tunes.
He isn't an EM ATK dual scaler in practice, it's just EM. His damage scales best with EM and so doe...