Basic Trope: A Nintendo Hard video game boss, usually in a fighting game.
Straight: In Destiny Duel III, the Final Boss, Blackhole, is difficult to defeat, due to him countering your every move, having high attack strength, and possessing a Super Move that fills the entire screen.
Exaggerated: Blackhole defeats you in one hit. Instantly.
Blackhole's AI is very powerful, but he is balanced for multiplayer.
Blackhole has a ton of cheap moves, but his AI is very poor.
Justified: The Blackhole that serves as the end boss is a powered up version of the one that is available in multiplayer, reflecting him showing his true power.