no more shadow essence in Treasure hunt?

The Troop-medals are a good reward in treasure hunt, but can anybody tell me, how a new player should grow his shadowdragon now?

You need to give players an alternativ to find shadowessences.

increase the droprate for killing dragons or put shadowessence in lvl 5 again or let players change fiercy essenses for shadow one.

But give us an alternative way to obtain shadow essences.