It could be Kingpin. He has the resources and the power to cause trouble for both heroes. He could try to use their meeting to his advantage, like creating a divide between them and then taking over the city while they're distracted.
Perhaps the Green Goblin could be the villain. He's a classic Spiderman foe and could pose a real threat to both Spiderman and the Shadow.
Venom could also be a great villain in this fanfiction. His dark and powerful nature would make him a formidable opponent for both Spiderman and the Shadow. He could target them separately at first and then try to take them both on when they team up.
Chapter 92, "Toward The Southern Atholor Continent III", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with The meeting concluded with a sense of finality, the Twelve Great... and follows through with She turned away, the mission ahead weighing heavily on her mind..
Chapter 11, "Second Mythical Summon", is the clearest early answer because it turns Essence Outburst's situation into a concrete plot event. The setup is Damien remained between the trees as he watched the various magic..., but the pressure keeps building through Damien knew where they were all heading..
Chapter 125, "Battling A Grade Two Mana Beast III", is the clearest early answer because it turns Obsidian Drake's situation into a concrete plot event. The setup is Damien stood still, watching the Obsidian Drake rise again., but the pressure keeps building through Its molten veins pulsed with fiery anger, smoke seeping from the....
Chapter 478, ", The Long-Awaited Technology Lottery", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The setup is Interstellar Warriors' "superbirth" was something Gu Hang considered,..., but the pressure keeps building through Just take it slow for now..
Chapter 481, ", Only a Madman Would Pay You Taxes!", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with But for now, it was enough. and closes on Demons wishing to invade Rage Owl Star?.
Chapter 428, ", I am the Dominant Bishop!", is the clearest early answer because it turns Warhound Titan's situation into a concrete plot event. The chapter gives readers a real answer by opening on In the span of over a year, she thrived on Jindi Star like a fish in... and ending on She smoothly passed the review conducted by a council of six....
Chapter 422, ", Close Your Eyes, It Will Be Fine in a Moment", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with Major General Du Shiliang, the formation you command will return to... and closes on I agree," Gu Hang was the first to express his stance.. The key payoff is that the chapter closes with "I can send you to Yunluo to request it., which gives Gu Hang a stronger narrative position and pushes the power growth onward.
Chapter 464, ", Was It Humiliating Before? No, the Humiliation Has Just Begun", is the clearest early answer because it turns Furyflame Battle Group's situation into a concrete plot event. The chapter turns that into something concrete by moving from Kedoba, who had originally planned to personally enter the fray,... to By now, Kedoba finally understood the meaning behind the Phoenix.... What makes it stick is that the chapter closes with It's the start of the month! The first day!
Chapter 133, "Leaving The Forest of Twin Disasters II", is the clearest early answer because it turns Narna's situation into a concrete plot event. The chapter gives readers a real answer by opening on The three individuals—Damien, Keith, and Narna—gathered near the... and ending on Finally, she sighed, conceding with a reluctant nod..
Chapter 489, ", Deadly Assassination", is the clearest early answer because the violence around Psychic Power becomes final instead of hypothetical. It opens with This situation is of no concern to the Imperial Guard. and closes on However, the three Imperial Guards did not relax their guard.. The key payoff is that the chapter closes with Goodnight..., which gives Psychic Power a stronger narrative position and pushes the power growth onward.