"The Beast spent millenia making them fear him, his fury unmatched by any within their horde..."

"Anthony Stark growing up had a passion for engineering. Whenever a problem faced him, he would make something to help him overcome whatever stood in his way.

This had helped him years when Stark Industries was one of the top producers of military hardware, but when his convoy was attacked and he was captured-"

"Pause." a black haired man with a goatee said, his eyes narrowing at what he was being shown.

"What is this? I thought I told you to forego what happened in Afghanistan." he said, looking over at the producer next to him.

"Well Mr Stark, our PR team thought that it would be more humbling for-"

"Humbling?" Stark asked, gripping the arms of the seat he was in.

"You think me being tortured to make a weapon for terrorists and seeing the one friend I had in there die right in front of me makes for a humble story?" he asked sternly, looking at the producer right in the eyes.

"Well-" the producer was cut off by the sound of a phone ringing, and Tony raised a finger to pause his thinking for a second.

"Who is this?" he asked, not recognizing the number, his brow furrowing a bit.

"Mr Stark." the voice on the other line said, before Tony felt sick to his stomach for a second then saw the area around him had changed.

"What the hell..." Tony muttered, disoriented for a second before hearing the shutting of a flip-phone.

"Care for some tea? Or something a bit stronger?" Stark found himself in front of a man in blue robes with salt and pepper hair with a goatee like his, as the man continued.

"And Hell is the reason you're here today."

[Radio scan complete. It appears that the Demons have not yet sent their hordes onto the planet below us, but all around the planet there are multiple missing person reports and still expanding.] Vega said to the occupant of the station, who was checking the planetary scanners but said nothing.

[Is there anything else you require?] Vega asked the Slayer, who was watching the planet turn below him, but shook his head before checking the scans of the planet.

[Also, it appears that several of the satellites in orbit have begun to take interest in the fortress. Should I put the fortresses point defence systems to taking them out?] the AI asked as the occupant merely shook his head as he was slightly disgruntled by the lack of major movement from the demons...

Meanwhile, in the New York Sanctum

"What do you mean 'Hell is the reason I'm here,' I thought I was here due to you kidnapping me." Tony said to the crimson cloaked man in front of him.

"I know you may have questions, but I'll try and answer them as best I can. But first, how about you take a seat?" the Sorcerer said calmly, as he folded space to have them sit in chairs near the great window.

"Mr Stark, do you believe in evil?" he asked the armored Avenger, a glass of scotch apearing in his hand.

Stark didn't quite know what was happening, if he was drugged or what, but crazier things have happened, like when he fought the literal God of Thunder.

"Depends on how you define evil." he said, giving the robed man an impatient and apprehensive look.

"Listen, I have things to do, and if you can apperate me back or whatever you did, I would greatly appreciate it." Stark said, looking around for the door.

"I mean actual evil; killing without mercy, having no kindness for another living being, fire and brimstone. That is what I mean by evil. You and your little club of friends may protect the earth, but what if I told you that there were dimensions of pure ideas?" Strange asked, raising an eyebrow at one of if not the smartest men in the world.

Stark was avout to retort, but was distracted by Friday.

[Hey boss, your satalites seem to have found something in orbit that shouldn't be there.] his AI sent through text to his phone, not wanting to be much of a nuisance in the middle of their conversation, where he quickly typed [Keep me posted on if it moves.] before looking back to the Sorcerer with a faux apologetic look...

Author's Notes:

I'm actually sort of suprised with the amount of suport this is receiving, given this was something I thought of after rewatching "Iron Man" and thought, "Hey, how would the Avengers handle going against the demons of Doom?"

So yeah,this is the result. I hope I can update this fairly often, but no concrete promises.

Now to answer questions you guys(and gals)asked:

Supersaiyajin4Vegeta: This will take place after base Eternal, due to possible DLC in the future so this us a bit if futureproofing in case more are added, and also so Doom Slayer will have all his weapons.

chewbie51: This is sort of before snap, but also might include things from Infinity War. I'm still trying to set a baseline for myself with this.

IHateGenericCereal: I will do my best to keep him pretty overpowered(Like, at least as strong as the Hulk, which I would say is about as strong as the Cyberdemon from 2016) while still maintaining how badass he truly is with his arsenal.

Feel free to ask anything, and I read all reviews so if there's anything I can do to improve my writing, please let me know.