Author's note:
This is my first story here. I put up a poll to decide what I'd write first and I got Discworld and HTTYD 50/50, so I was forced to do a crossover. If you like it then tell me, I might write more. If you don't like it, then I'd just like you to know, I don't take harsh comments well.

We start our story in the large and unruly city-state of Ankh-Morpork, where two wizards were in the current leader, Vetinari's, office, trying to sort out an issue reality was having there.

"Uh, Archancellor! I don't think that's a good idea!" Ponder Stibbons winced as Ridcully stuck his staff into the Inter-Dimensional-which-has-nothing-to-do-with-quantum-I-promise-sir-Portal. His staff hit something and made a hollow thump. It was unclear what was on the other side, but whatever it was, it made a distinctive growl.

Just then Vetinari entered the Oblong Office, "What's not a good idea?" Eyebrow raised he stared at Ponder, who sweated slightly under the glare of the Patrician.

"Its fine, Ponder, see?" The Archancellor thrust the staff through the Portal, it hit something again which roared.

"Sir! I'm not sure you should aggravate it." Ponder replied. Ridcully wasn't listening.

"It sounds like it would be good for huntin', doesn't it?"

Snotlout blinked at his Monstrous Nightmare, Fireworm, who was scratching at the outside wall of someone's house. The dragon paced a few times then scratch again and growled. Snotlout wasn't used to seeing his dragon so agitated, especially at a wall.

"What's going on, boy?" Snotlout tried asking. Fireworm looked him in surprise, then roared and turned his attention back to the wall. Snotlout took a few steps back and scratched his head. What was with Fireworm today? He decided it was best to give him some time to himself.

"Well, whatever it may be, I would like it removed from the office. Are you capable of this?" The Patrician stared at Ponder again.

"Well, sir, we are yet to discover whatever is causing it to happen," by 'we' he meant I, "At the moment we think it might be something to do with the movement and alignment of universes, as the-"

"Can you fix it?" Vetinari said much firmer, with a stern look.

Ponder panicked under his stare and looked around for someone to intervene, he noticed something. "W-w-where'd Ridcully go?" he managed to stutter out.

They both checked the room, he wasn't in the office. In fact he wasn't even in the same universe.

Ridcully grinned at the curious and vaguely annoyed dragon. He carefully moved his hand to his hat and found his pistol crossbow. He whipped it out and shot the beast with a preloaded bolt. It bounced uselessly off of it. The dragon stared at the fallen bolt then looked up at Ridcully. It growled. Ridcully tried to find some other weapon, failing to find one he looked back at the creature. He noticed that it was on fire.

"Sir!" Ridcully turned to see Ponder running towards him with a look of terror on his face, upon seeing him, Ridcully lost his balance. As he fell a large fireball flew past where he had been standing.

"What did you do that for?" Shouted the enraged Archancellor. Ponder gave him a confused and desperate look.

"It was going to kill you!"

"I was doin' just fine!"

The dragon interrupted their conversation with another roar and fireball. Ponder noticed something.

"Sir, we have to leave!" Ponder cried, attempting to pull him away, back to the Portal.

Ridcully ignored him and pushed him off, "you're not the only one who can make fire." He smiled at the beast and swirled his staff and hands around, whilst muttering something under his breathe. He finished and threw his hands out towards the creature. Nothing happened.

"Sir! Please!" Ponder urged, "we can't stay!"

"Where'd my fire go?" Ridcully gave his hands a puzzled look.

So what's going to happen? Who knows? If you like it, let me know.