"Uh where are we going? We're already flying for hours!" Snotlout grumbled.

"I think I found a clue guys," Hiccup answered, "Toothless and I found something you should definitely check out".

"Oh, is it a destructive war machine?" Tuffnut brightened.

"Yeah, it would be awesome to check it out!" Ruffnut grinned.

Hiccup rolled eyes.

"No, it's not a war machine. It's something more important".

"What can be more important than a war machine?" Tuffnut didn't surrender.

"Hey, Hiccup, look!" suddenly Fishlegs pointed on a small island, where there were strange footsteps on the beach.

"Yeah, that's it!" Hiccup brightened up, "That's what I wanted to show you!"

The friends flew down and got off their dragons.

Hiccup touched the footsteps and examined the sand, frowning, and then turned to Fishlegs:

"What do you think it is?"

"Um... I've never seen footsteps like these before..." Fishlegs got surprised, "But I'm certain it's not a boulder class. The feet aren't that big".

"Whatever it is, it's what attacks our island every Friday night..." Hiccup frowned, "Because the dragons we know would never attack Berk, we're in peace with them".

"So what should we do?" asked Astrid.

"We must find this dragon," Hiccup puckered.

"How? We don't even know where to search," Tuffnut was surprised.

"I think I'll find some information in my books," Fishlegs smiled.

So the friends got home, and Fishlegs instantly delved into his books to find out something new about the unknown dragon that was attacking Berk.

But it was useless. There was no footstep match with any dragon.

Meanwhile, the night came... and Berkians heard a terrible growl...

"He's coming back..." Stoick the Vast puckered, "Prepare your weapons!" he ordered. "This time he won't escape!"

"Dad, let me and my friends handle it," Hiccup asked his father, "I know we can stop this mess!"

Stoick sighed, frowning.

"Okay, but remember, I give you the last chance!"

Hiccup gathered his friends. They all mounted their dragons and flew up in the sky, searching for the attacker to appear.

And soon, they saw the orange flames in the sky, hitting Berkians' wooden houses!

"There it is!" Fishlegs cried.

"Toothless, give us some light!" Hiccup ordered.

The night fury blasted out his blue fire, lighting up the sky, and there could be seen a huge dragon with horns, cogs, and bloody wings!

"Wow..." Fishlegs widened eyes, "It's a whole new species!"

"Whatever it is, we should stop him," Hiccup frowned.

"I will stop him!" Snotlout proudly smiled and flew towards the unknown dragon!

"Snotlout, no!" Hiccup cried.

But the rider didn't listen to him.

"Hookfang, fire!" he shouted.

The monstrous nightmare spitted out fire, trying to hit the dragon, but this latter dodged it with his wings, then swung them and the strong wind caused by it hit Snotlout and Hookfang, dropping them to the ground.

"Ah!" Snotlout cried, and touched his head, feeling dizzy.

"Looks like its wings are fireproof!" Fishlegs brightened.

"Well then, let's try another weapon!" shouted Astrid and flew towards the dragon, "Stormfly, spine shot!"

Deadly nadder hit her cogs to the dragon, but this latter dodged them with his wings again, swinging them and now dropping Astrid and Stormfly down.

"It's too strong!" Fishlegs cried.

"So strange, I've never seen a thing like this before, hitting dragons to the ground in one swing," Hiccup puckered, "Okay bud," he turned to Toothless, "Now it's our time! Fire!"

The black dragon spitted plasma out of his mouth, but oh, miracle, even night fury's blow was dodged by the unknown dragon's bloody wings! And what's more, the blow turned back to Toothless and his master!

"Toothless!" Hiccup exclaimed, and the same minute the blow hit them and dropped them to the ground.

The dragon growled, burned the houses and disappeared in darkness...

Ruffnut, Tuffnut and Fishlegs flew down to their friends.

"Hiccup, are you okay?" Fishlegs asked.

"Yeah... I'm fine..." Hiccup stood up, "Looks like the blast isn't as strong when it's reflected... How are others?"

"We're alright too," Astrid answered, "What was that thing?"

"We at least saw it," Hiccup said, "Fishlegs, what can you say?"

"I assume it was a stoker class dragon," he replied, "as it was blowing fire... But those bloody wings... I have no words..."

"We will deal with it," Hiccup frowned, "Now let me work out a plan".

At that night Hiccup was busy drawing the dragon he saw, and at last, he drew it, and was amazed how deadly and dreadful it turned out.

The unknown dragon (drawn by author).

But at least they knew how it looked like. Now they only needed to find it...