It's been three years since Hiccup has left Berk, and a couple of months since the Arendell incident.

Today, Heather was inspecting the island and Hiccup is flying with a pack of dragons in the air to see if they remember what Heather taught them the previous day.

While she was doing that, Toothless and Hiccup are flying in front of the dragon group, leading then around the island.

"Okay, bud, let's see how they are." Hiccup says to Toothless. "V formation!" He shouts to the dragons and they all go into a V shape behind Toothless.

"Not bad, team." Hiccup congratulates seeing they're picking up fast.

"Diamond formation!" He calls out and they all move into a diamond shape without a hinge. "They're learning well, don't you think, bud?" Hiccup asks Toothless who snorts in agreement as they go through their routine.

-

Back on the island, Heather is doing her spot check on all of the Night Terrors after she had finished her check on most of the Nadders and Gronckle except the few with Hiccup.

"Okay there's Night Terror 542, 543. They're easier to spot during the day than at night, wouldn't you say, girl?" She asks her dragon as she continues her search.

"Easier to spot that they're a million of small dragons and easier to count. We just finish up these guys and then Nightmares and Terrible Terrors, and last being the Nadders and we can be done with it." Heather tells Windshear who's happy to hear that.

She takes Windshear in to land in an opening and sees a pack of Night Terrors. "Okay, there's a few of them down here." She states when a small golden dragon falls down onto her saddle.

"Hey there, little guy. You're new, aren't you?" She asks thedragon as part of her saddle gets put on fire and she freaks out and puts it out quickly. "I'm pretty sure they were called Fireworms. What are they doing here? They haven't shown up in the past few years we've been here." She asks herself.

"It could've just lost its way." She states and looks around when another Fireworm comes down and starts another fire. "Windshear!" She shouts and her dragon just blows out the fire as if it was nothing. "Okay, I'm sure I should tell Hiccup about this." She says and gets onto Windshear and take off.

-

Hiccup was just finishing up morning routines and went in to land when he saw Heather flying towards him. "Hey there, Heather. Something wrong?" Hiccup asks her when she comes close enough.

"There's something I think you need to see for yourself." She says to him and he decides to call the dragons back and gets to Toothless and takes off and follows her while she explains the situation.

"It just started with one Fireworm, and as we were flying around, we started to see even more of them." Heather explains as Hiccup looks to see small fires are starting from the little of Fireworms there are.

"Well, this can't be a migration, because if it was, the whole island would be on fire. But yet again, the Book Of Dragons says when they are migrating, they send out some scouts to go ahead of them to see if the route is safe. They might be changing route. And our island is just in their new path. Which means eventually an entire flock of Fireworms are on their way soon. And will burn everything to the ground." Hiccup says to her.

"How much time do you think we have to get prepared?" She asks him.

"From what I recall from Berk, a week maybe at best." Hiccup explains knowing they need to prepare.

"We put in too much time and effort for this place to just be burnt down. We have to save it." Heather says and Hiccup agrees.

"You're right. We better start fire proofing the Sanctuary. Find a place for the dragons to be high and dense enough for the flames won't reach them. And then build a fire break and make a clearing so the fire doesn't reach our home. And possibly start gathering water. We don't know how long they could be migrating here for." Hiccup says and they split up the jobs.

Hiccup works on the fire line, Heather says she found a few caves she could check out to see if they're big enough to fit most of the dragons and gathers some water for them and their dragons to last them at least a week.

-

Heather was just filling up anything she could from their huts with water when she notices a strange rock near the ledge. She finishes filling up the containers and looks at the rock. "Is this a claim stone?" She asks herself and sees writing on the rock.

"I, Magyar Thorston, hereby claim this island in my name and the name of all my family present and future, forever and ever." Heather reads what's on the stone. "That's a strange way to end a claim." Heather says to Windshear as her dragon peaks it's head to see what she's reading, even though she can't read.

Later Hiccup comes down to help her get water and sees her looking at a rock. "Hey, what you looking at?" Hiccup asks her while walking towards her.

"I'm not entirely sure. But apparently someone called Magyar Thorston actually claimed our island." She tells him and Hiccup reads it himself.

"Wait...Thorston? As in..." Hiccup thinks about the teens back on Berk and remembers the Thorston twins and fear strikes him. "Toothless, plasma blast." Hiccup tells his dragon and Toothless blasts the rock and it flies over the ledge and falls into the ocean.

"What was that about?" Heather asks, never seeing him act like that.

"Trust me, were better off forgetting what we just saw on that rock. The Magyar Thorston's current family members...let's say we wouldn't have lasted as long with them in charge. And even though it's impossible for them to find us, let's not take chances." Hiccup tells her and she remembers him talking about the teenagers on Berk and decides to leave it.

"Let's just get back to preparing for the Fireworms. They're starting to show up in bigger groups." Hiccup tells her and she turns to see smoke heading their way and they have too much to do to worry about the stone.

-

As the night sets in, Heather and Hiccup put on their suits since there fireproof, and they see all the Fireworms start migrating towards the island.. "Okay, I'll take my group and start gathering all of the Night Terrors." Heather says to Hiccup.

"Okay, me and my group will circle the Fireworms around the island and onto the dry island in the chain. That way all the dragons will be out of harms way and they can't burn anything. And if that doesn't work, I'll go back to the fire break." Hiccup says and they get to work and she flies off.

Hiccup and his group try to stop the Fireworms from approaching and they're all following the path they plotted. After trying several attempts of getting rid of them, nothing works and Hiccup decides to get back to the fire break.

"Keep it up guys. The fire can't get through if it's only dirt in it's way." Hiccup tells his team as the Nightmare is burning all the trees in the way while the dragons are all digging through the ground to make a barrier.

Toothless is using his plasma blasts to make holes for the barrier and Hiccup is trying to work but the smoke is making it very difficult. "I can barely see out here, bud. If this gets much worse, we're gonna have to bail out and find Heather and the Night Terrors at the cave." He tells Toothless when Windshear flies up to them and Hiccup sees Heather riding.

"You might need to find a new plan, dragon boy. I couldn't find the Night Terrors anywhere, I traveled as far as I could to find them. They're just gone." Heather states to him.

"Okay, it might be time to...oh no." Hiccup says as he sees something coming in the distance. Heather turns to look and sees a gigantic Fireworm heading their way.

"The Fireworm Queen. Okay, if she's here, the entire flock is gonna be here sooner or later. That means we have to bail. We might be able to make it to Arendelle before nightfall if we hurry." Hiccup says, seeing that as the only plan left is to come back after they leave and see what they can fix after the fire is gone.

"Wait, Hiccup, that's not the Fireworm Queen." Heather states and Hiccup gets a closer look and sees it's the Night Terrors in the shape of the queen.

"The Night Terrors. They're protecting their island by forming the Fireworm's Queen." Hiccup realizes and gets an idea.

"I'm sensing we're not abandoning the island and you have a plan." Heather states to him and he does.

"I'm gonna lead the Night Terrors out to the sea. Hope that the Fireworms will follow. You take my pack and use them to put out the fires." He tells her and leaps into the air towards the Terrors.

"We have to get their attention and turn them out to sea." Hiccup tells Toothless and they fly up to the Terrors. "Okay, gang, let's take a trip, shall we?" He asks the Terrors and Toothless shoots a blast that the main Terror sees and commands the others to follow Hiccup out and the Fireworms see them and fly off.

Hiccup then leads them to an island not far from theirs so there's no chance they'll come bark around, and it's made of rocks and there's nothing to be burnt around.

"Perfect place for these guys, don't you think?" Hiccup asks Toothless as they fly over the island and the Night Terrors all separate and the Fireworms stop following them and lands on the island.

"And that is something to write about. And Heather thought there was nothing else that could be written." Hiccup tells himself and flies back towards their home.

Heather and the group of dragons are putting out the last of the fires when Hiccup flies overhead.

"That Dragon Boy continues to surprise me, Windshear." Heather says and travels back to the Edge. Hiccup is in the main building waiting for her as she enters and sees him lost in his thoughts.

"So are you gonna tell me what you're thinking about, or am I supposed to pretend like it's nothing?" She asks him.

"It's just...it's just after thinking of the twins, I got like some flashbacks from my life on Berk, it's nothing." He tells her.

"Hey, if something's bothering the other, we have to be open to each other. That's Rule number two, remember? It's not a you problem. It's a us problem. Besides, you always said you hated Berk." Heather reminds him

"Yeah, but it was once my home. I mean, the Edge is my home now with the dragons and you. It's just hard to let go sometimes."

"What happened there, lead you here to this place. To the Edge, the dragons, even to me." Heather replies.

"Yeah, you're right. Besides, what's the chances of them running into us out here? Oh, there's something else I need to talk to you about." He says as he starts looking through his notes.

"I've been talking to Trader Johann. And it seems that Dagger is trying to raise a armada. And I was even able to use his information to learn what he did with your villages things he stole. I have a few thieves locations on where they are." Hiccup admits to her.

"So, we're stealing from others now?" Heather asks him.

"No. We're taking back what was stolen from your village." Hiccup corrects her and she's okay with any version of it.

"Yet again, Dragon Boy, still surprising me." She says while smiling and kisses his cheek. "But maybe we should wait for the damage of the island to cool down and make sure all of the Fireworms are gone for good." Heather says and Hiccup sees that's the best plan.

But what they don't know is that the path is gonna lead them back to Berk.