Moments pages are Spoilers Off. Read at your own risk!
General
- Calamity Ganon. The entity, the abomination that has polluted Hyrule with is power and presence for 100 years. It's outright described as a ghostlike entity that happens to look like a boar with a volumetric mouth that can open at ninety degrees and a roar that literally sends a shockwave through the air. Its very presence sends a chill down Link's spine when he first sees it. The cocoon its regenerating inside of is also described with nauseating features. Nothing about this entity is remotely human. What's even worse about this version is that Calamity Ganon is a bit of a misnomer. This thing is far worse than the original entity because the true nature of Calamity Ganon is that it's the curse of Demise at its most powerful. It had taken Ganondorf Dragmire's soul as a slave for over 120,000 years, and Ganondorf has been completely aware of this for that entire time.
- Its first form is a perfect description of Calamity Ganon as seen in The Legend of Zelda: Breath of the Wild. It's nothing but a disgusting "body" that looks like a giant spider made of guardian legs and the weapons of the blights, held together with nothing except nasty Malice that serves as its flesh. And this thing is even more vicious than the Anti-Climax Boss he was seen as in the game. This time, he fights both Impa and Link at the same time, and has them on the ropes even after suffering a massive strike from the Divine Beasts. With each powerful attack it falls victim to, it grows even angrier, using whatever dirty tricks it can. It gets so aggressive and tactical that it nearly kills Link, who's only saved by Mipha's Grace. It takes Impa and Link almost everything in their power to defeat it.
- And then there's the final boss itself. The final form of Demise's Curse, the curse given its purest form. Dark Beast, the Hatred and Malice Incarnate, with Ganondorf completely freed from the curse. And it's stronger than the game's version. For instance, Impa has to actively contain the monster to ensure that it doesn't escape and that its attacks don't affect a greater region. And it's not until after Link uses the Wolf Spirit to win a game of Beam-O-War with Dark Beast Ganon that Zelda is actually able to weaken it from inside. Had Impa and Link not retrieved their spirit animals, Hyrule would have been doomed, even they had defeated Calamity Ganon.
- Dark Beast Ganon. Without the soul of Ganondorf Dragmire to keep it tame, the curse is free to adopt its most powerful form. And this time, there was no indication that it had any real weakness at first. It literally was invulnerable at first, and it took Impa using a containment spell and Link winning a Beam-O-War to finally weaken it enough for them to fight back.
- The Shards of Calamity Ganon: The Blight Ganons. They are far more dangerous, violent, and aggressive than they were in either game. They fight with ferocity and viciousness. They inherited the malicious character of Demise through the curse that created Calamity Ganon. They're described each as Eldritch Abominations, with extensive Body Horror about how unnatural they look. They seem like barely living beings, and as each one of them are killed, their deaths are not a pleasant sight to see.
- The Yiga Clan are far more vicious, violent, and bloodthirsty than they were in the game. They are explicitly shown murdering innocents. Especially ominous are the moments where disguised Yiga Clan members attack Link out of nowhere. They reach the apogee of their horror when Link discovers their torture chamber, and especially when they lay siege to every settlement in Hyrule. Had it not been for Barta overhearing their plans, the Yiga would have won!
- Their very existence and creation is just as horrifying. They were created because of the royal family's rejection of the technology that saved them from Calamity Ganon. The Sheikah who had helped to save the technology were rewarded for their assistance with exile. As a result, several Sheikah decided to get payback by siding with the apocalyptic entity under the delusional belief that he would spare them from its violent rampage.
- It's later revealed that the Yiga weren't all given to this propensity for needless violence. Sooga's dialogue implies that they used to be far more pragmatic than sadistic, but something in the past possibly influenced Master Kohga into a more needlessly violent direction. It says a lot that members of the Yiga Clan itself think that some of their own actions have gone too far.
- The final disturbing moment is the fact that the exile of the Sheikah and the rejection of the technology was part of the Golden Goddesses' Long Game to finally eliminate Ganon. Did they explicitly do this to create the Yiga to ensure Ganon's return 10,000 years later? If that's the case, the Goddesses literally created a terrorist group that would kill and terrorize the land for 10,000 years. Yes, it was to further a greater cause, but that's still a horrifying implication.
- The Divine Beasts and Hyrule Castle are chock-full to the brim with nightmarish imagery. The entire atmosphere when within these structures is never bright. No matter the humor present, there's always the underlining threat of Calamity Ganon's power in the overarching scenes. Especially Hyrule Castle, which is full of depictions of skeletons and dead bodies.
- The fact that Rudania was already marching around Death Mountain even before Calamity Ganon first manifested around the castle means that his power was already growing before Link had actually awakened. Zelda was already starting to wear thin in her duel with Calamity Ganon, hence why she had to call in Link to help her.
- The Blood Moons. The moon rises, unnaturally large in the sky, and has a vicious red glow. As it gets closer to midnight, Malice suddenly forms everywhere, with Ganon manifesting around Hyrule Castle, and monsters suddenly reforming around the land, and they grow stronger each time they're resurrected.
