This is most likely a topic, that has already been made, but I think it would help to have a mode or section in the castle which houses all enemy types.
Perhaps a small arena based level which a player/'s could spawn in hordes, bosses, specials to test their weapons, in a care free and contained environment. Perhaps the option to make the enemies hostile and or docile.
I’m not saying the practice dummy is bad, it just doesnt offer the same “training ground” for players.
P.S. The damage on the dummy/'s does not generate career skill cooldown.