Hello, and welcome to this crossover! I've had it in the works for a while and couldn't resist anymore. ^^;

Let's be honest, this comes from two reasons beyond "It's been simmering in my head and won't leave me alone": one, I haven't seen a BH6/HTTYD crossover that quite scratches this itch, and two…I love Obake, okay? To the point that the episode "Countdown to Catastrophe" was heartbreaking and not in the way the writers probably wanted. T-T/

So for the foreseeable future we'll be updating this every other Thursday—I'm wanting to finish up The Things We Do For Science, so hopefully we'll be seeing that one on the other Thursday. Wish me luck, because I have some writing to do. :D

Also, forgive me, but the dragons are going to have strange names for a while. But I'm sure you can guess who's who. ;D

So without further ado, let's get started….

Big Hero 6 © 2014 Disney

How To Train Your Dragon © 2010 DreamWorks

They hadn't always fought dragons—once upon a time, things were different.

But times change, especially under the weight of fear and anger.

"You can't do this!"

"I daresay I can."

"What you're proposing is suicide! We can't fight those dragons—we can't even find their nest! We don't know where they come from to even stop them!"

"We can and we will! I am through with losing people to those monsters!"

"I know you miss your daughter, but you can't doom the village. We won't stand with you if you do."

"No, you won't—I know I have enough people to back me; you've lost your position, Granville."

She fell back a step, teeth gritted, looking at the crowd—a crowd that was slowly splitting into two groups, one backing her, one backing Callaghan.

And the crowd backing Callaghan was much bigger.

"You have five minutes," Callaghan spat. "To get you and yours off of this island."

Granville scanned the crowd, the crowd looking bristling and angry…nodded finally, resigned. "Very well. I pity those whom you are leading to their doom."

"You can extend your pity from elsewhere."

He watched, still bandaged, still broken, still bruised—watched people he knew scrambling—his chest was thrumming with tension, rattling his broken ribs—

He had not been looking forward to them coming to him. Had not been looking forward to her pleading, to Granville coming in behind, the way her expression shifted when she saw his—

"We have to go—come on, you can't stay here. You're coming with us, right?"

He could—he could have. But Callaghan had promised him—had promised him no limits. Granville would insist on those limits.

And after the last attack, he'd be lying if he didn't say he wanted a little revenge.

"I can't," he said finally, hating the heartbreak on their faces, hating the way she hugged him, ginger yet desperate, not wanting to leave her friend….

Hating Granville putting her hand on his shoulder and looking him in his good eye.

"Find us," she told him. "When you can, come find us."

And then they were gone.

That had been twenty years ago, now, and Obake was still questioning whether or not that had been the wise decision.

Mostly, he questioned this whenever he felt like his skills were being underappreciated—such as now.

"They're over this way!"

"They're attacking the stores!"

"My house is on fire!"

All of which was to be expected, when one lived where dragons were an occupational hazard.

Dodge around the fighters running to deal with the burning houses, grab a pole, use it to vault over the carts blocking the way, grab one of his devices as he ran by and shoot it up at the shape flying overhead—a Gronkle hit the ground heavily a few moments later. Trip one of his traps—a Nadder behind him suddenly lost its footing. Roll away from a Monstrous Nightmare's fire—it set the trigger on fire that dropped a steel net on itself.

And did he get the recognition he deserved? That would be a no, thank you.

Well, sure, quite a few of the people still living in Yokai appreciated him, or at least his work—not so much himself, he reflected, dodging around a couple of people fighting off a Zippleback; he, as always, had a tendency to rub people the wrong way. It wasn't his fault he was brilliant, but he was certain they didn't see it that way.

One thing no one could deny, though: there was only one other person in the whole village that had taken down more dragons, and that was their leader, Callaghan. Robert Callaghan had been like a man possessed after his daughter was taken, destroyed anything that stood in his way with a singlemindedness that kept everyone in place, even when they attacked settlements instead of dragons.

It was why Obake was currently finding himself with the limits that he had been promised would not exist. Because Callaghan would not let anyone stand equal with him, would pat Obake on the head like he was still a teen and send him on his way. He had hit the ceiling of his advancement ten years ago—ten years ago, it had become clear to him that his only value to anyone was as a dragon slayer.

Ten years ago, he began to deeply regret staying.

But there was nothing for it—the others that had followed Granville were long gone, possibly long dead, and no one would touch anyone from Yokai; they had garnered too fearsome a reputation.

No one would touch anyone who was cursed, either.

Now that was pure idiocy in and of itself—he didn't believe it for a minute, that in being attacked by a dragon, he had been marked by one as well. Curses were for superstitious idiots.

Unfortunately, he didn't really have another explanation for the left side of his face, which had the habit of glowing in a ghastly color and pattern when he was agitated. Trying to control it was why he had gotten a reputation for being cold and aloof. Which, to be fair, meant he had some peace and quiet—

"Head's up!"

Duck down, knives zinging straight through the spot where his head had been, burying themselves in a Nadder's head—scowl in the direction the knives had come—

Momakase blew by.

"Try to stay awake, hon!" she called back, yanking her knives free and giving him a smug smirk.

"Maybe if tonight were actually challenging," he shot back, keeping tone and voice precise. "I could have slept through this."

"Go ahead—more for me—"

They both cut off at the high whistling noise—the explosion—the sight of one of the towers collapsing on itself in a bright white light—

"Night Fury!"

"Ah, excellent," he hissed, savage grin on his face as he ran for the forge—something he had been working on, would be perfect to shoot that thing down—

Because there was only one dragon that Callaghan had not succeeded in killing—only one that no one had ever brought down.

And if he did…well, consider that ceiling shattered.

Practically dive into the forge, rooting around, digging out the tripod-mounted device—curse those bumbling buffoons, it'd take him all day tomorrow to straighten this out—run back out, heading for the cliffside as several others dodged Nadder spikes—

Force himself to be calm as he set up, lest his unfortunate skull pattern give himself away—Night Furies, from his observance, attacked the towers, destroying them so other dragons could attack without fear. Intelligent, sure—but with an attack pattern like that, they were predictable to the right person.

He was that right person, had calculated the trajectory right down to the microsecond—just set up, wait, wait….

He heard the whistling approaching, from his left—it meant it would be illuminated for a split-second after the tower went—wait, wait….

Boom.

There!

One shot—net flailing out—

And then a dark shape, arcing towards Akatori Point.

He couldn't help the triumphant bark, the fist pump—he hadn't been this thrilled in years, but he had done it—done the one thing Callaghan hadn't done—face flaring in his excitement—

A roar—a whistling noise—

He dove for cover, device exploding a moment later—

Which was about the time he realized there was another Night Fury.

Said Night Fury was bellowing to suit his species name, glaring at the not-dragon before flying up, screaming for help as he scanned the dark ground below—

Honeysuckle-in-Full-Bloom was almost instantly at his side, breaking away from her supervising and directing route.

"What? What happened?" she demanded.

"Little-Brother!" he bellowed. "That—that thing shot down Little-Brother!"

Honeysuckle gasped, clasping her front paws to her muzzle, blue eyes wide—yes, that was about how he felt on the matter.

"Cut the raid short!" he ordered. "We have to find him! We have to find him before the Yokai do!"

She nodded, spinning away and up, roaring to attract attention before roaring the retreat-regroup-return pattern—

He was already shooting off in the direction that Little-Brother had arced away to, scanning the ground—couldn't see anything for the thick trees, and with no moon—they had picked the new moon for this very reason, and now that stinking orb didn't even have the decency to help him find his brother!

He should have never have agreed—should have never agreed to let Little-Brother come along, no matter how insistent, no matter how begging—he was hardly old enough to be let out of the nest, brimming with precociousness—he had thought—they had all thought he could handle it!

"Now remember," he had told him on the flight over. "You stay on my tail at all times. No grandstanding, no splintering off and attacking, all I'm going to do is fly around and attack the towers before going and doing a supervising circle with Honeysuckle. Okay?"

"Okay," Little-Brother had said, vibrating with excitement, Blue-Firescales cheering him on, equally excited—Swift-Strike had been more calm, already focused on the mission, Healing-Talons looking like he was already anxious about any potential injuries. Possible, considering their destination.

Greenscales had shared this sentiment.

"Am I the only one who's worried about this?" he asked the flight at large. "These not-dragons are the worst—everyone knows Yokai are the worst! They're worse than Vikings, guys—VIKINGS!"

Older-Brother agreed, and he knew that most of the flight did too—but Mountain-King wouldn't be accepting that, would be eating them if they refused. All he could do was waggle his wings at the Stormcutter apologetically.

"We'll be fine," Swift-Strike said, signaling the other Nadders as they neared their destination. "Just stick to the plan."

"I'd rather we attack one of the other settlements—Berk, even! At least they take prisoners!"

Healing-Talons tipped his wings up so he was flying next to Greenscales. "There there—it will be fine."

Older-Brother hoped so.

But now things were not fine, Little-Brother had been shot down and everyone knew that a downed dragon was a dead dragon what would he tell Older-Light-Fury he had promised to keep Little-Brother safe and now—

Now, because someone had been aiming for him, had been half a second off in aiming for him, they had taken down Little-Brother.

Someone was going to pay.