DemonDoll3 on Flight Rising

Corrupt Authorities. Maybe your clan leader is secretly evil, or the Dragon Cops are cruel, or maybe there's some larger authority outside of your clan that's evil (ex: your clan is a town in a larger kingdom). Tip: Most people aren't evil for the sake of being evil, think of what your antagonist/s are GAINING from being corrupt. Is it money? Influence? Power? Is there something else they want? Cults, countries, companies; all of these fall under this category.

False Prophets and Conmen. These are dragons who are lying (intentionally or unintentionally) to gain power in your clan, or to try to make some specific outcome that benefits them happen. A dragon who pretends to see the future, a dragon who is lying about some dangerous creature to sell defenses against it, these all fall under this category. Tip: Not all antagonists THINK they're malicious; a dragon who sincerely thinks they were commanded by the Icewarden to burn down the local inn doesn't think they're being evil!

Counter-Culture. Some dragons are going to go against the popular culture, for a variety of reasons (maybe they disagree, maybe they want to stand out, maybe they feel outcasted already, etc). A large counter-culture scene can provide an antagonistic force for the primary culture of the clan. Tip: Just because they're "antagonists" doesn't mean they're EVIL or VILLAINOUS. They're just, well, a contrary force.

Force of Nature. This is a dragon (or, well, any kind of creature) that represents a force of nature more than a typical personality. They are both restrained by their nature, and emboldened by it; a dragon who is the incarnation of Death may seek to kill, a dragon who is the incarnation of Storms may create storms without realizing or caring about the consequences, etc. Tip: You can get really esoteric with this, just be careful to not place them in a protagonist role! Forces of Nature are antagonists because they're powerful and constrained by odd rules; when you put them in a protagonist's role, you'll end up losing narrative tension.

Overwhelmed by Curiosity. These are your mad scientists, your cackling inventors, your dwarves digging too deep; they aren't evil in the traditional sense, they're just driven by a sense of curiosity that leads them to do horrible things to find answers. Tip: Pick an obsession for them, and run with it! Think of the most malicious ways they can find answers, and figure out why they're convinced these methods are the ONLY way.

Wild Animals / Instinctual Hostility. This is for your non-dragon antagonists and monsters, who are hostile towards your dragons for innate, instinctual reasons and are impossible to negotiate with. Tip: If you want a more black-and-white evil vs. good scenario, having a bunch of these guys as minions provides good tension without adding too many moral quandaries.

Parasites / Mind Control / Possession. Need a convenient reason for a protagonist to turn into an antagonist? Some form of mind control or parasite that takes control of a character's mind is a great excuse. Is it taking over one dragon, or multiple? Is it sentient, or just acting on instinct? Is there a mastermind controlling it, or does it trigger some latent hostility in its host? Tip: This is a great antagonist if you don't want any of your dragons to be evil, just make sure to establish strict rules on how the mind control happens, and how it ends.

Your dragons should be wrong sometimes. It doesn't have to be all the time, but they should misunderstand things, lie (intentionally or unintentionally), lash out when they're stressed, or just flatout dislike someone for no reason. Everybody will make bad decisions, and it's an easy way to introduce conflict without needing a specific antagonist character.

The world should be dangerous in some way. Think about your clan, and think about where your dragons would reasonably encounter some kind of danger. Is there a lot of crime in your clan? Is there a portion of your clan's territory that has a lot of hostile fauna? Is your clan currently clashing with another clan? Who knows, maybe the biggest danger is getting humiliated at the PTA bake sale, but try to think deeply on this. Once you know what places are dangerous, you can start thinking of how your clan deals with that danger.

A 100% approval rating government doesn't exist. The larger your clan, the more likely that there's dragons who disagree in some way, shape, or form with how the clan's being run. Maybe you've got an Anarcho-Capitalist Lightning clan with a small sect of Eco-Socialists that dislike the current rulers. Maybe you've got a tight-knit family unit but there's a dragon who doesn't agree with how chores are being divvied up. Maybe you've got a monarchy but, oops, you've got one dragon who REALLY disagrees with the concept of a monarchy!

Quick conflict is easy, prolonged plot is interesting. A conflict that can be resolved in 2 hours has a lot less narrative weight (typically) compared to a plot that takes 2 weeks to resolve. Err on the side of letting things fester and intensify if you want the juiciest conflict.

Your dragons should have wants just like anyone else, and those wants should conflict. A highly ambitious dragon joining a clan with well-established authorities is going to feel stifled by their inability to rise through the ranks. What happens when multiple dragons are courting the same dragon? What happens when multiple dragons want the same den location? Two dragons with deeply opposed desires can be the cornerstone of a lot of great lore.

Sometimes bad things happen for no reason. Natural disasters, plagues, sudden global conflicts (ex: Luminax), all of these things can be introduced quickly to churn up some conflict. Be careful to rely too heavily on this though, as it can erode away at your dragons narrative agency and make things feel grimdark (unless that's what you're going for)