RPG elements like Health and Energy are included as a basic start up. The Launch Attack costs energy, which refills after a certain amount of time. This can be implemented however you wish, as you could set the color of the energy bar in the UI to yellowish, perhaps, for stamina, and then make it so that attacks you want to drain stamina drain stamina by simply following my example for the Launch Attack, and/or write your own more elaborate and unique-to-your-project code.
Thanks.