Prologue: Web of Shadows

Remnant, Salem's Domain

Ever since the Green Goblin has been beaten a couple of months ago and the multiverse has been saved, the world of Remnant and its people have found a renewed form of peace, confident that they can take on any threat, whether they are from space, another dimension, or even someone from their home world, like the cold, cunning, not to mention malevolent master of the Grimm, Salem.

The Grimm Master was humiliated and utterly embarrassed during Goblin's short, dark reign over the multiverse, having most of her inner circle killed by his hands, her Grimm under his control, the relics eternally lost and absorbed by the Amazing Spider-Man, and to top it off, was KIDNAPPED and tortured during the "Day of Reckoning". So it's safe to say her plans to rule over Remnant has been foiled completely…or so she wants her enemies to think.

Thanks to one of her surviving subordinates, Cinder Fall, she gotten access to a Refined Reactive Chaotic Iso-8. The ISO-8 are mysterious rocks that scattered in millions all across Earth recently, each containing unspeakable amounts of power, with the Reactive/Prismatic type ISO-8 being the strongest form apart from the A-ISOs and E-ISOs, and now the cunning Salem has one in her possession.

In the past month, Salem has been plotting a scheme to one-up Norman Osborn, having learned the existence of multiple universes, and plans to take control of both Remnant and Earth by extensively studying the ISO-8 and learn more and more about its limitless capabilities. One trick she learned was the ability to use its power to increase the strength of her Grimm to new heights, dubbing them "ISO-Grimm". She has also harnessed the ability to warp and teleport all across the world with a simple thought, though to her displeasure, she doesn't seem to have the power to transport herself to different dimensions without the proper tech like a Webware to help harness that ability. Fortunately for her, using her new "ISO-Seer Grimm", she can at least observe the other worlds through her small creature's new abilities and study them and their inhabitants without being noticed, but she's been mostly interested in two particular, but fascinating worlds.

"Hmm…" The Grimm Queen sits on her chair and looks at the image of a world different from her own through the Seer's head, spotting a familiar-looking blue hedgehog running around at the speed of sound. "Sonic the Hedgehog, Hero of Mobius. One of the chosen few that can control the light of chaos, the Chaos Emeralds, and has used them to save his world countless times from total destruction. How amusing." She said with her collected and calm tone of voice, with not the tiniest hint of worry in her voice.

The foggy image from her Seer transforms to that of Earth-616. "And then there's Earth, the prime and marvelous world that keeps out universes stable and in control, housing the universe's most dangerous items of power and individuals, more particular him…" An image of a kid in a red-and-blue spider costume web swinging through the streets of New York City. "Spider-Man…Also known as Peter Parker, and the Avatar of the Great Weaver, creator of the Web of Life and Destiny. The 'Hero of Destiny' that could control the light AND the darkness, and the only mortal whose immeasurable potential could surpass even the gods. Fascinating. Quite fascinating indeed." She said with a small, devious smile on her face. "And if I were to beat this hero, then the sacred gates leading to my dreams and ideals will finally be open."

She gets up from her chair. "I really must express my gratitude to Norman and his accidental creation. Thanks to the two of you, my eyes have been opened. In all my years I never knew the existence of 'other worlds' and 'universes' that contain knowledge that would prove beneficial to my goals. And if I were to achieve my goals, annoying pests like Spider-Man and his friends must be eradicated, but how?" She asked herself.

As Salem ponders on a plan to defeat Spider-Man, her ISO-Seer shows her a foggy image of a being that looks like Spider-Man, but all dark and monstrous. "Ah yes, him. The one they call…Venom." The Seer shows her multiple images and footage of Venom's numerous battles against Spider-Man, overwhelming him in all video clips while Salem continues talking to herself. "I, too, have been also observing this abnormal and alien creature ever since I first laid eyes upon him during the climactic battle a few months ago. His 'symbiote' possess VAST similarities to my Grimm, but at the same time possess an incomprehensible amount of abilities none of them could ever achieve on their own, like the ability to take a host and increase their strength that could even overpower Spider-Man and the other heroes."

BGM-Dragon Ball Xenoverse 2 OST - Open Field Stage

She commands the Seer to project a large-size hologram of Venom into the room. "Yes…The symbiote is the key to completing my plans. If I could obtain a sample, just a sample, I could use my ISO-8 to fuse its boundless potential with the power of the Grimm. A Grimm-Symbiote. With me as its perfect host and master, commanding an army of Symbiote Grimm, both Remnant and Earth will be mine to conquer as their supreme queen, and the likes of Spider-Man will be ultimately powerless for what I will become. I hope you're ready, Hero of Destiny, as to you, Villain of Chaos, because you'll both be instrumental in what's to come." She said with a wicked smile, staring at two holograms of both Spider-Man and Venom, sparking a new, chaotic adventure for our favorite Web-Slinger and his friendly neighborhood, while simultaneously igniting the web of flame of his two rivals, Eddie Brock and Cinder Fall.

Spider-Man and Cinder: Flaming Web of Light and Shadow

BGM End

KFX here: Greetings readers, new and old, after a short break, welcome to the start of the next story in the United Heroes series. It's another crossover between Spider-Man and RWBY, this time an adaptation of the game "Spider-Man: Web of Shadows" but without Team RWBY. What? Yup, if you haven't guessed from the title, this is more a Spider-Man/CINDER crossover, with the latter having more of a focus in the story this time. So yeah, no Team RWBY or the likes of Team JNPR apart of this story besides maybe a few cameos. Don't worry, I do have plans on bringing in a couple Huntsmen into this story to make it feel more like a crossover. And since school is starting up for me again, I won't be able to upload as frequently as I would like, but I'm still determined to finish this story, and thankfully it won't be as long as Battle for Remnant, I promise. Anyways, see ya next chapter.