There are several encounters you can encounter as you explore Final Fantasy XIV, from dangerous dungeons, hectic trials, and world bosses. One notable world boss coming to the Dawntrail expansion is Ttokrrone, and there’s a specific way to spawn him.
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Like other world bosses, there are certain FATE quests that you need to complete. By doing them in the correct order and when they are available in your FFXIV world, Ttokrrone will spawn in that world. You don’t want to tackle them alone, though. Instead, you’ll want to bring a lot of people with you to help defeat them and earn the rewards.
The only way to spawn Ttokrrone is to complete the four FATEs that spawn on the map and force them to spawn in your FFXIV instance. You can find these FATEs in Shaaloani. Before attempting to complete them, I recommend collecting all the Aether Currents in Shaaloani and unlocking the fly ability for your mount. After doing this, you will be able to reach the area where Ttokrrone spawns.
You must complete these four FATE quests to receive the final FATE, The Serpentlord Seethes, who spawns Ttokrrone.