Doom Days (Harry Potter/MCU Crossover)

Pre-Chapter A/N: More chapters on my patreon(https://www.patreon.com/c/Oghenevwogaga)— same username as here and link in bio. 

"Riddikulus" I muttered for the umpteenth time, turning this version of myself into a pale facsimile of a ghost that lost its tether to the ground and floated off into the ceiling. I chuckled. That one was actually almost funny. The creature winced, but apart from that, just continued its footing. It was the tenth boggart I was facing in a row, and after the second, they had stopped triggering my rage, instead triggering a sort of amusement on my end. It was funny just how many they were. Especially since part of me was certain that Hogwarts hadn't imported any of the creatures for this task. They were just part of the castle's ecosystem—as much as the ghosts or the suits of armour were. 

I rounded another corner, and a ghost—a woman wearing a tattered gown—screamed in my face. I winced at the sound before offering her a deadpan look. A wave of my wand reduced the sensitivity of my hearing—the exact opposite of the extrasensory charm, but localized and applied to my ears alone. Switching the intention of certain spells and thus their effect had been something that Flitwick and I had been working on before our working relationship came to its end. 

When she finished screaming, I reversed the spell before asking her in my most "done with this shit" tone, "Are you about done?" 

"No reaction, Potter?" 

"None. Now, do I have to be rude and pass through you, or are you going to get out of the way?" 

She huffed and passed through me instead, leaving me with a sense of a chill about my whole body as she flew away muttering about the impertinence of youth. I didn't even know her name. Hogwarts was the most haunted place in Britain, and it seemed that even the ghosts that usually avoided students like the plague were coming out to get a view of the proceedings of the task. I ignored a head that poked out from the ceiling as I made my way around the last bend and found myself before a familiar portrait as it was swinging itself shut. Fuck. Someone made it here first. I marched forward and tickled the pear, but there was no reaction. It was frozen still. I took a step back and only then noticed some writing at the bottom of the portrait in Latin—'probare tuum valorem'. Prove your worth, I translated while staring at the pear. Now, just how was I supposed to do that? 

I heard footsteps behind me, and just as I prepared myself to disillusion, I heard the voice. "Don't even think about it, Potter. I've got a one-way transparency charm on this wall and I can see you about to disillusion yourself." Diggory's voice rang out. I chuckled and abandoned the attempt, taking a step back to welcoming the Hogwarts Champion's arrival. 

"You made it here pretty quick," I said. Even to my ears, it sounded like an accusation. 

"Followed Krum. He's loud and never checks his back, so it was easy enough," he said easily, tossing his wand in the air and catching it again. 

"Okay, that's all well and good, but what do you want with me?" I asked this time. 

"Remember the second task?" He asked, and I began to chuckle. If that was what he was here for, then this was going to be a very short task for him. 

"Here for revenge for that? Trust me when I say that's not going to go well for you." 

"No, no. Of course not. Just making sure you don't get the chance to come for me. So I'll look at the puzzle or whatever is keeping the kitchen hidden, and I'll take your word that you won't attack while I open it up for both of us," he said, stowing his wand away and stretching his hand out. I looked at the hand, and flicked my eyes back to his face. This was a lot of trust he was showing in me. At least, he probably wanted it to seem like a lot of trust. There was no chance he didn't know that whoever attacked here would have a bad rap in front of most of the wizarding world. 

Betraying him would be even worse than betraying Krum that first time would have been, so I reached out and took his own hand in mine. We pumped up and down twice, and I stepped back. 

"Probare tuum valorem," Diggory read out before chuckling. "Well, that's easier than expected. Definitely easier than the key thing. That one tripped Krum up for so long that I had to consider stepping out of hiding to help him out." 

"What is it?" I asked. 

"You don't see it, Potter?" He asked, with a quirked eyebrow. 

"If I did, I wouldn't be asking, would I?" I retorted, quite sharply by my own reckoning. 

"Sorry, sorry. It's just something we learn as children. Makes sense though. You know, you growing up with muggles and all. Blood is your value in this world. You are worth nothing more than your blood," he said before slashing his hand with a wave of his wand and splattering the blood on the portrait. It swung open and he jumped in. The portrait swung back closed before I could make it across. 

I considered cutting my palm like Diggory had, but that was stupid. There were more nerves in the palm than the rest of my arm. I made a slight cut around my forearm and levitated the blood before splashing it on the portrait. It swung open for me to enter, and entering the kitchens revealed pandemonium. I stopped on a dime, barely managing to keep myself from falling off the ledge. The entrance was gone, and behind me was nothing but a rough wall. On the ground was a thin ledge, and beyond the ledge, a massive drop. It was so deep, I couldn't see the bottom from here. There were floating stone platforms all across the massive cavern that the kitchens had been transformed into. 

Each of the floating stone platforms stood a considerable distance away from the ledge, and from each other, but it was clear that they made up some sort of path to the larger platform at the edge of the room. The platform that I could see that both Krum and Cedric were on their way to. That was probably where the next coin lay. I took a breath before casting a featherweight charm on myself. It took to some extent as I shot myself at the platform with a silent Venti. The wind charm blew me off like a cannon, and to prove that I had far from thought this through, I overshot the platform I'd been aiming for. Fuck. 

'Carpe retractum' I mentally incanted, sending my body flying back at the platform that I'd overshot by quite some margin. Of course, when I saw the stone surface hurtling towards me—or was that the other way around? I rethought the plan and added a new element, casting a cushioning charm a scarce few seconds before I smashed into the rock. It felt like landing on a pillow. I'd overpowered that by a fair bit. Panic? 

I turned to the next platform, trying to decide a different strategy. The present one was far from efficient. Cedric was essentially trying to split the platform into pieces and levitating rocks to form a stone bridge between him and his next platform. A single finite could ruin his whole thing and send him screaming to the ground. I wasn't going to take a cheap shot like that in front of the wizarding world, but there was no guarantee the others would be similarly restrained. Krum was too far away that I could clearly see how he was making the jumps, but copying him was far from my intention. Especially since I'd had an idea. 

This was going to hurt if it failed. I called to my mind as much of a frog's anatomy as I could remember from my biology class, and then transfigured both my feet in one fell swoop. It was a quick transformation, never giving myself the chance to second guess my choice here and watching my legs morph underneath my trousers into giant frog legs. My featherweight charm was still in place, so that was an additional boost. I took a breath before jumping, and this time, I only overshot the next platform by some small margin. After a quick carpe retractum and cushioning charm, I decided that this was working. 

I took another breath before jumping to the next platform, and this one I nailed spot on. That was when I heard the sound of stone grinding and turned around to see that Fleur had arrived. I turned away from her and jumped to the next platform, before quickly jumping to the next one, overtaking Cedric smoothly. I decided my next target, and went for it only to be forced to seize and pull myself towards another platform as a spell shot through the space I was about to fly through. 

I turned around to see that it was Fleur that had sent the spell my way. She had somehow transfigured wings from her back and was flying straight for the central platform. She would easily outpace both Cedric and I if she made it without opposition. Of course, this was the Triwizard Tournament—there was no lack of opposition. Cedric sent a piercing hex her way that she was forced to turn around to deflect. I forced her to form a shield proper with my blasting curse as I prepped and jumped to the next platform. 

The spell she sent my way was deflected right in Krum's direction as I noticed he was only two platforms away from the goal. He managed to dodge by the skin of his teeth, and then he turned to the rest of us. Just as expected, Krum didn't back down from the fight that was brewing—even if it would probably have been wiser for him to keep going rather than wasting his time trading blows with the rest of us. He sent one curse my way, and another Fleur's. I deflected his spell in Cedric's direction, forcing the Hufflepuff to abandon the bridge he was forming and shield against the spell. Fleur just banked, dodging the spell and continuing forwards. I flicked my wand against my platform, using a slow powered blasting spell to send rocks loose from the platform like Cedric was doing to get the stones he used for his bridges. Another flick of my wand turned the stones into ravens with steel-tipped beaks. They flew right for Fleur while I exchanged spells with Krum across the distance. 

Even with all the space between us, spells still flew so quickly that there was no room for error. I stepped aside from a cutting curse and returned fire with a rupturing curse and piercing hex chained with a blasting curse right behind. Krum shielded all three with a bright gold mage shield he formed with a tight circular movement of his wand. No incantation as well. Someone had been practicing. Of course, I used the fact that he had shielded rather than deflected to jump to the next platform. His next spell came right at me just as I landed but I deflected this one right back at him with double the speed by catching the spell on my wand first and then matching and overcoming the intent behind the Conjunctivitis Curse he sent my way. 

I turned to the side and deflected the spell Cedric sent my way in Fleur's direction. Busy dealing with the ravens I sent her way, it was all she could do to dodge out of the way of the piercing hex Cedric seemed to be favoring lately. Krum dodged his own spell and came with me with even more ferocity. Now, if only there was some actual skill behind the ferociousness then I might have had cause to worry, I thought to myself with a chuckle as I bobbed and weaved through his spells while deflecting some of them—either at Cedric, Fleur, or back to sender. 

He seemed to growl with rage and then arced his hand backwards before lashing out with his wand like it was a whip. From the end of his wand came a thin stream of blue flames that covered the distance between us faster than any spells had, and rocked my whole body when I blocked with a protego. The whip—for that was what it was—rested against my shield for a second before Krum brought it to bear again, sending it against my shield and this time forcing me to take a step back from the force that his spell clattered against my shield. This was a fire whip, yes, but not a variation of the spell I'd ever come across, and that alone was impressive. 

I dropped my shield once Krum drew his hand back to send the whip flying my way again, and then I did something that I was sure he could never have suspected. I aimed straight at him. A piercing curse covered the distance between us like a bullet out from a gun, and he weaved his wand, forcing the fire to return to his side in a wide arc. It was that fire that moved and sent my spell clattering off to the side, its target left safe and unharmed. Interesting. While he blocked, though, I took the chance to jump to the next platform. I did a quick count. There were four platforms between Krum and I. 

He sent the fire whip my way once again as I landed, and I took advantage of the sponge-like knees my partial frog-like biology gave me to land and then jump again, jumping clear over the line of blue flames. I returned fire by conjuring two perfect spears that fell upon him from above as I returned to the ground. He moved his fire whip, drawing it back to himself and moving it to intercept the spears. I used the chance to jump across the space to the next platform. Three. From the corner of my eyes, I could see Fleur had continued her flight for the central platform. So she had finished with my birds already. With a heave, I decided to be drastic. I pointed my wand behind me, and just as I thought, the floating enchantment on the platform gave way to my direct intent. So it was Elven magic just like I suspected. 

I used a levitation charm to toss the massive platform straight at Fleur while using the motion to drop to my knees and avoid the crackling fire whip. Krum was beginning to become more than just an irritation and I was not appreciating it much. I took control of the platform right in front of him and banished it backwards, forcing it to slam into Krum's own platform. The two giant stone slabs hit and vibrated, Krum struggled to keep his balance and I used the chance to jump across the space, using an overpowered Venti to push me the rest of the way so I landed on the platform right in front of him this time. One. There was one platform between us and it was the one I had forced to slam against his. 

I had to turn to the side to allow Cedric's spell to fly past my shoulder and hit nothing but air, continuing on into the distance. Cedric himself? He was no longer on his platform. It took me a second to find him hurtling through the air with both hands on his wand as he swung like he was attached to some rope from the ceiling, coming straight in our direction. I was about to send a finite in his direction and bring an end to whatever harebrained scheme the Hufflepuff had cooked up in his mind but had to turn the wand movement into that for a protego at the last second as Krum sent a chunky black spell my way. 

When it hit my shield, I felt feedback spread through my body. The shellshocker, I thought with gritted teeth as I forced my body to fight through the pain and deflect Krum's next set of spells. I couldn't do anything fancy like send them after either Cedric or Fleur when it was all I could do to keep ahead of them. Nonetheless, keep ahead of them I did, and when the time came, when Krum took a second too long with his next spell, I returned fire, keen on smiting him like a vengeful god. 

He dodged my blasting curse, but that was a leader to the two arcing slicers I sent for his feet. He crouched and formed a shield. A shield that I shattered in one single blow with the most powerful bludgeoner I'd ever sent. The feedback knocked him off his feet and sent him rolling backwards. I turned my attention to Fleur who was just then flying past us and making her way to the final platform. I rallied my wand like a whip and latched onto her leg with said whip. 

Except that I hadn't fully considered her momentum as she tore me from my feet a second later. It hit me then that there were three of us in the air at the moment. I brought my wand back to more important things, silently dispelling the featherweight charm on myself allowed me to weigh her down enough that I was able to force my feet to the ground one platform ahead of the one I had been torn from. Once I hit the ground, I planted myself as solidly as I could, and pulled taught on the rope joining us. Fleur came to a halt, stopping, no matter how much she strained. She finally turned to cut the whip with her wand, but I pulled at it then—now that she was no longer contesting it with her momentum. 

With pure strength, I dragged her back and sent her crashing into the platform. Cedric, screaming for joy for some fucked up reason came to a rolling halt on the platform a second later before he returned to his feet. Krum on the other side, pushed himself to his feet even as Fleur was doing the same. 

Somehow, we were all on the same platform now, wands held tightly and curses on our lips. 

A/N: Enjoying my version of the third task? I quite enjoyed writing this. Next four chapters up on patreon(https://www.patreon.com/c/Oghenevwogaga)(same username as here and link in bio), support me there and read them early.