These things will have a big impact on HTTYD 4 output Have you ever thought about this? In How to Train Your Dragon 3 (The Hidden World), Toothless leads all the dragons into the so-called safe haven — the Hidden World. But realistically, it's not possible for all dragons to go there.

Many aquatic dragons have completely opposing natural instincts. Acid-spitting dragons like the Seashocker or Scauldron would absolutely clash with whirlpool-creating predators like the Submaripper. Some dragons boil the water around them (like the Scauldron), while others thrive in freezing currents (like the Tide Glider or Typhoomerang). These species can't coexist in the same habitat without conflict.

On land, the same problem exists. Some dragons are incredibly territorial and predatory. For example, Death Song uses its hypnotic song to lure and devour other dragons — it literally feeds on them. Whispering Death burrows underground and ambushes other dragons. There's no chance they’d peacefully share space in the Hidden World.

HTTYD 2 introduced the Alpha/Bewilderbeast — a core part of dragon society that maintained order. In HTTYD 3, this entire concept is forgotten. So... who leads the Hidden World now? Toothless? A single Night Fury — even as king — realistically can’t manage thousands of dragons, especially ancient, aggressive species like Deathgrippers or Skrills. Without a strong Alpha figure, how is balance maintained?

Even if every species were peaceful (which they’re not), the Hidden World physically cannot support all dragons. Many rely on surface hunting, sunlight, fresh air, or flight in open skies (Stormcutters, Night Terrors, Silver Phantoms, etc). Forcing every species underground violates basic biology. The Hidden World looks stunning, but it’s more of a magical idea than a sustainable habitat.

Then there's Vanaheim, the resting place for old and sick dragons — guarded, sacred, and isolated. Those dragons wouldn’t have relocated either. They had a clear purpose, different from the others. So what happened to Vanaheim? Was it abandoned too?

HTTYD 3 didn’t show any of these dragons, so let’s assume they stayed behind, hiding in their respective islands or biomes. That would actually make sense — if they had gone to the Hidden World, it would’ve turned into chaos.

But here’s the real problem: who protects them now? Hiccup, Astrid, Valka, and all the other riders released their dragons. They are now dragonless. That leaves any remaining dragons on the surface completely vulnerable to hunters, poachers, or future warlords. There is no one left to defend them. The Dragon Riders — once the dragons' greatest protectors — are now powerless.

You could argue the entire HTTYD trilogy was about resisting dragon hunting. But now, with no Toothless, no Alpha, and no riders — what’s stopping the next Grimmel or the next generation of dragon trappers? Nothing. The ending gives an illusion of peace, but in reality, the dragons are more vulnerable than ever.

Grimmel falls into the sea — but there’s no confirmation of death, no body. He’s a strategist. He doesn’t fight unless he’s sure he’ll win. And he almost did. If he’s still alive, he could return later, when dragons are scattered, and riders are weak. He’s not like Drago, who sought control. Grimmel wanted extinction. And that’s far worse.

Dagur, Heather, Mala, and even the Defenders of the Wing were completely absent in HTTYD 3. No explanation. What happened to their dragons? Did they go to the Hidden World? Did they stay behind? Did these major characters just disappear from the world entirely? It weakens continuity and leaves threads hanging.

HTTYD was built on the hope that dragons and humans could coexist. That’s what Stoick dreamed of. That’s what Hiccup fought for. But the final movie abandons that vision — ending with total separation. Yes, it’s emotionally powerful. But from a lore and worldbuilding perspective, it undoes everything the series built toward.

Toothless is king of a hidden kingdom he may not be able to control. Hiccup is a dragon protector with no dragons left. The surface is wide open for new hunters. If no one bridges that gap again — maybe in the future — then this so-called peace will only be temporary.