There's a common experience among Europa Universalis 4 players, which is that of loading up the game, picking a nation in Eastern Europe or Asia, and then getting completely stomped by the Ottomans. This massive empire, the popularisers of the funky fez, will stomp you into the dirt like a cigarette. I've got some bad news for players who already fear the Ottoman advance: they're now even stronger than they used to be, as one player has proved by conquering the world with them in 73 years, without resorting to the popular speedrun tactic of starting as a horde.
The player, Trisolarian, carried out a blistering advance across the early modern world, with their entire world conquest taking from 1444 to just 1517. If you're wondering how they managed to conquer the world so quickly (it's not uncommon for it to take players until 1821), let me tell you. The latest EU4 DLC, Domination, has given the Ottomans a particularly problematic perk. That is the ability to make Eyalets. Eyalets, which Wikipedia drily describes as 'a primary administrative division of the Ottoman Empire', manifest themselves in-game as somewhat autonomous vassals.
While the Ottoman player doesn't actually 'own' the land as such, it will change to the subtle green of the empire and contribute to your force limit, manpower and sailor pools, and give you some cash. The biggest advantage is that, like subjects of a centralised Holy Roman Empire, they don't take up a diplomatic relations slot. Their liberty desire, which stacks with normal vassals, is calculated independently, too, meaning they're far less likely to rebel. While they don't join your war by default, you can call them in for a trifling maximum of 20 favours.
Did anyone ask for an Ottoman
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