Here is another new Quest suggestion for Small Giant to consider;
An African safari themed quest.
The vanilla heroes encounter one of the Lions or one of the Zulus, and The person talks about the lack of water in this hot, dry, environment, and how only the Strong can survive here.
As the combatants are all fire element, I suggest that the reward a one star and two star fire trainer heroes. A three star at the 3rd and final stage.
The bosses, of course, be the five star lion, and the five star lioness.