Bug Fables final boss cheese with pebble toss

As of v1.1 of bug fables, pebble toss has the hidden property of being able to ignore all defense, including the scripted 10 HP cap for the everlasting king and the beast.
Using this and the ability to stack hustle berries, it is possible to skip both heals of the final boss.
This feature is intentional, so don't send it to the devs saying it's a glitch, it's not.