Mythos
Dev Diary 1: Dragons
Hello, and welcome to the first dev diary for the reborn Mythos: Historical Fantasy mod. When I first played the original mod, I was drawn to the dragons right away, so when I started working on improving the mod, they were one of my first areas of focus.
While many fantasy creatures come from a single region, like the Djinn, or have a main region for their design to focus on like the Giants, dragons vary quite a bit from region to region, ranging from the winged reptiles seen in most modern sources, to giant snakes, even to multi-headed giant humanoids. however, nearly all show them just as an antagonist, leaving the reasons for their behavior unaddressed. As a result, dragons had more room for interpretation and design than most of the other races.
Religion
The dragons follow their own pagan religion, worshiping dragon gods maligned by the human religions. They hold that dragons were created by the Babylonian goddess Tiamat to rule over humans, until the human gods killed Tiamat's husband, Abzu, and drove the dragons westward. Dragons hold that they have souls made of gold, and that possessing gold will in turn strengthen their souls for the new world. As such, hording gold is not just a habit, but a pious duty.
This is represented by the draconic religion's Purity mechanic - a scaling trait which measures how well a dragon is strengthening their soul, through gold, power, and fame, while avoiding bowing to or consorting with humans. As this increases, they will gain more taxes, prestige, and piety. A dragon can take a decision to consult with draconic elders on how to improve their purity.
Upon reformation, it is clear that the dragons can't hold against the Christian, Norse, and Muslim threat without a formal religious structure, as well as a way of appealing to humans. After reforming, a ruler with at least 3 holy sites can grant one of those to the priest there to form the Sapphire Flame, an independent religious head. In addition to calling Great Holy Wars and improving your Moral Authority, the Sapphire Flame has a number of interactions similar to the Catholic Pope's Papal Favors. The Sapphire Flame can grant divorces without having to pay your spouse, disinherit non-dragon heir, grant claims on impure dragonic pagan rulers, bless you to give additional purity, or give you money at the cost of lowering your purity for a time.
A character can also grant adjacent land to ally with the Sapphire Flame. In addition to this improving their opinion of you, the draconic Theocracy has access to some strong military buildings on holy sites, and the Sapphire Flame can ignore the holy site location restriction, potentially making them stronger that their size suggests.
The draconic holy sites are Lejre in Sjaelland, Canterbury in Kent, Pruszkow in Plock, Whithorn in Galloway, and Uppsala in Uppland. These specific locations means that they are likely to clash heavily with both Norse Pagans and Catholics.
Each of the Draconic Holy Sites has a unique building known as the Eternal Flame. To a draconic pagan, these offer additional taxes, prestige, piety, and troops. For other religions, they just offer negative events. However, a ruler of another religion may decide to devote effort to seeing just how "eternal" the eternal flames are. If they succeed in putting one out, the draconic religion will take a heavy blow, and the only way to reignite one requires the ultimate sacrifice...
Governments
When ruled by dragons, different forms of the governments will be in place, representing a relatively small number of dragons ruling over the larger human population with an iron claw. Most of these allow raiding, but prevent lowering the tax obligation below balanced.
However, one particularly different government is Draconic Tribalism. Instead of using the pagan County Conquest to gather land, the small number of dragons lack many conquest CBs and focus on taking tribute instead. They have access to a modified Tribute CB which take a chunk of money up-front. Additionally, when the tribute dies, they will be forced to either continue the relationship, rebel, pay off several years of tribute at once, or swear fealty as a vassal.
Since they lack options for expansion to reform their religion, dragon tribes have alternatives for adopting feudalism or republicanism.
Both require you to be at peace, have Absolute Tribal Organization, have your main building fully upgraded, and have 500 gold stockpiled.
Becoming a Merchant Republic requires 4 tributaries, and upon creation, the other great houses will come from those neighboring nations.
Adopting Feudalism requires that every neighboring ruler within one sea zone pay tribute to you - harder than it sounds since each death can mean the loss of that tribute, and your death means starting all over. Alternately, if you find this would require forcing someone like Francia or the HRE to pay tribute, you can form a kingdom, though, again, this can be harder than it sounds due to your limited expansion options.
The last government of note is the Flamesworn Theocracy. Although not playable, you are likely to interact with them in some way. This government is used by both the Sapphire Flame and by Draconic Pagan theocracies who rule a holy site. They have access to additional military building in their holy sites and make landed members of other religions pay additional taxes, like the Muslim Jizya, so they typically wield more power than other Theocracies.