Pitch Black getting attacked and dragged by his own nightmares.
Max Mordon transformed into a mummy by the very power to make him immortal he went out to seek.
Mordred aged into an extremely old man by the power he used to rule the world.
Johann frozen by the bewilderbeast’s breath.
Snoke getting killed by Kylo Ren with his grandfather's original lightsaber which he activated with The Force itself.
King Sombra's only way for him to be defeated and killed is by using the magical Crystal Heart.
Cozy Glow being stopped by students after her plan was thwarted by Young Six.
The curse that Simone Lenoir and Lena Dupree used to punish Morgan Moonscar for ruining their lives and killing their friends have been put on them as well to be life force-sucking monsters for eternity.
Unicron did not notice that the Autobot Matrix of Leadership's power was the only weapon and key to destroy him.