One idea could be that the Deathly Hallows are actually Infinity Stones in disguise. Harry, Ron, and Hermione could team up with the Avengers to stop Voldemort and Thanos who have joined forces. The Marauder's Map could be used to track the villains across different dimensions.
Imagine Doctor Strange opening a portal to the wizarding world. He could help Hogwarts students learn new forms of magic that are more similar to his own. Meanwhile, Harry could show the Avengers how to use magic wands. And perhaps the Dementors are related to some dark force in the Marvel universe that the Avengers need to fight together with the wizards.
A cool plot could be that the Time - Turner from Harry Potter has a connection to the Time Stone in Marvel. The Avengers and Harry Potter characters have to travel through time to prevent a major catastrophe that would destroy both their worlds. The Sorting Hat could also play a role, for example, by sorting some of the Avengers into Hogwarts houses based on their personalities.
Chapter 238, "Decisive Victory, Reprimand, Hou Tong's Plan (Part 2)", is the clearest early answer because it turns Pingxi Plain's situation into a concrete plot event. A useful checkpoint is the way the scene starts with When Luo Yuan reported, his tone was very calm, but even so, most... and follows through with Rather than risking your lives for territory, it's better to stay in....
Chapter 165, "Yin Yang Mirror", is the clearest early answer because it turns Yuwen Hu's situation into a concrete plot event. The setup is Wake up, everyone, wake up." "Don't be fooled, don't be fooled, wake..., but the pressure keeps building through Yelling, flying kicks, slaps, collisions, nothing worked..
Chapter 159, "Blood and Flesh Wall, The Leader Hasn't Broken Through Yet?", is the clearest early answer because it turns Teng Jiao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Sir, he has already taken people to the east corridor, and Zhao Hu... and follows through with Luo Yuan, take people to kill the Teng Jiao; Zhao Long, you three.... By the close, Xia Chuan turned his head;
Chapter 213, "Long Mountain News, Ecstasy, and Riot (Part 3)", is the clearest early answer because it turns Luo Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with This is what a clever person does! and follows through with There's been a riot in the mining area!. By the close, There were seven people in the cave;
Chapter 176, "Resistance and Reason", is the clearest early answer because it turns Xiao Ning's situation into a concrete plot event. The chapter turns that into something concrete by moving from In the Ice Abyss World, the weaker the human camp, the more they... to He did not expect the other party to refuse him directly without even....
Chapter 234, "Probing, Arrangements, and Hou Hu’s Confidence", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. It opens with The strength of Zhaoyang, which challenges the status of Long... and closes on Beehive took a more direct approach, building the station underground....
Chapter 174, "Fusion, Manifestation of Yang, Conflict of the Director", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After the Skin Remodeling was completed, it wasn't just his basic... and follows through with Left alone in the room, Xia Hong took out a white mirror from behind....
Chapter 265, "The Martial Tournament Officially Begins, Advancement Impossible (3)", is the clearest early answer because Snow Mane finally turns buildup into a real advancement. The chapter gives readers a real answer by opening on Qiu Peng turned around and nodded to Yuan Cheng and the others behind... and ending on Especially the logging realm participants attending the martial....
Chapter 236, "White Dew Gu, Despairing Yuwen Dao, Yang Lu", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. It opens with Now that things have come to this, the destruction of Yanglu Camp is... and closes on Great Xia Minister, Xia Chuan, Leader Peng, I'm quite interested in.... The key payoff is that the chapter closes with "Alright, Leader Peng is straightforward.
Chapter 227, "The Scam at the Gate, Three Groups, and Yuwen Dao of Great Xia", is the clearest early answer because it turns Hou Ming's situation into a concrete plot event. Early on, Broadsword, close-fitting black clothes, could it be Yuwen Hu?. By the end, The terrifying force of the iron arrow caused his entire body to....