Today’s work: a first look on the stamina bar for the Flight!
Of course the icon is just a placeholder, but it works just fine!
The stamina will deplete not over time, but as you get further and further from the place where you lifted off.
Wyvern can fly for around 15 tiles before landing, but that will be possibly changed with items enhancing her skill! As you can see, depleting your stamina or releasing the skill button (Left Ctrl by default) over an impassable tile will move the character back where it started!