Corrputed Player578

Just a few days ago, on Minecraft 1.18, something truly terrifying happened to me and my friends. Me and two f my friends, Jacob and Phil decided to start a creative world to build things and experiment with the new update.
We spawned in a plains biome, except it wasn't a normal plains biome. We instantly realized the trees were covered in black vines and the grass was black.
"What the heck is going on?" Jacob asked. (We were communicating via Skype call).
I looked up at the sky in shock when i saw the sun was black and the sky was grey.
"Guys, look at the sky," I said. I could hear my friends gasped when they looked at the sky.
"Did you mod this world, David?" Phil asked. 
"No, I have no idea what's going on, let's leave and create a new world."
We all agred, but when I hit the save and quit button, it said Unable to Quit
The same thing happened to my friends, then we saw someone with the gamertag of Corrpted_Player578 (for some reason they spelled "corrupted" wrong) write a message in the chat.
The message said "If your loved ones died, how would that change you?"
"What the heck is going on?" Jacob asked.
I tried to hit the power button on my pc. but it wouldn't do anything.
"Guys, I can't turn my pc off, I think whoever-"
I break off as I hear Phil scream.
"Phil? Phil? Are you there?"
I looked down at my phone and saw that he left the call.
Then, I looked back at my monitor and saw Jacob's character was frozen in place.
"Jacob? Are you there?"
I got no response, I look down at my phone again and see the call had ended.
Then, I saw it. It was a character with a zombie skin, but it had glowling, black goo all over it.