Darkest/scariest thing in an E/E10+ rated game

[Evil Ghost Lady]

As the title implies, this is a thread to share things you think are dark or scary in an E or E10+ rated game. (or whatever the equivalent is in your country)
Kirby has surprisingly dark lore and bosses that are cosmic horrors.

 

[Baconfry]

spoiler warning

Spoiler: Pokemon Mystery Dungeon: Explorers

In the second half of the game, Darkrai poses as Cresselia to suggest that you and your partner should commit suicide.

 

[The Storm]

This cutscene from Sonic Unleashed (E10+) while not really dark or scary, was quite gory:

Spoiler: Video

 

[Animus Viral]

Grinding.

The hands thing in legend of zelda, majora's mask, at the bottom of the well.

 

[Sylv]

The moon in Super Mario Odessey where Cappy possesses a human.

 

[qwerty3.14]

Spoiler: Spoilers for Fire Emblem: The Sacred Stones

So in a early chapter of the game you have this unit named Orson, he betrays you. The enemy had told Orson that they would bring his wife back to life if he did so. Several chapters later Orson is a boss you fight, at the beginning of the chapter you see Orson talking to his 'wife'. You never see this 'wife' but surrounding context when other characters talk about the 'wife' imply that it is merely a mindless zombie.

 

[The Master Chief]

That part in Subnautica where your swimming along and you accidentally go into the void for the first time and like 8 adult Ghost Leviathans just come out of nowhere and attack. I screamed so loud my cat attacked me.