Seconding Nero, in that all races can be found just about anywhere in Eorzea. While Gridania and the Black Shroud are noted as being the specific haven for Keepers of the Moon, they are found elsewhere in the world. Melvaan's Gate (the Arcanist Guild) in Limsa Lominsa actually has a Keeper/Seeker cross-breed working for them named Rubh Epocan.
A bit of lore about the Arcanist Guild:
Melvaan's Gate was established shortly after the rise of the current Admiral, Merlwyb Bloefhiswyn roughly 14 years ago. Prior to this, Limsa Lominsa was a bustling free port and haven for piracy, smuggling, and all imports and exports into and out of Eorzea. Melvaan's Gate was created to inspect and tax all of this traffic, which is the job of the Melvaan Arcanist. Today, Limsa Lominsa is still the center of all maritime trade in the world and requires that all goods entering Eorzea first go through Melvaan's Gate for inspection. Naturally, these regulations have not pleased many of Limsa Lominsa's pirates.
Hope this helps! ^^ Let us know if you have more questions!
A bit of lore about the Arcanist Guild:
Melvaan's Gate was established shortly after the rise of the current Admiral, Merlwyb Bloefhiswyn roughly 14 years ago. Prior to this, Limsa Lominsa was a bustling free port and haven for piracy, smuggling, and all imports and exports into and out of Eorzea. Melvaan's Gate was created to inspect and tax all of this traffic, which is the job of the Melvaan Arcanist. Today, Limsa Lominsa is still the center of all maritime trade in the world and requires that all goods entering Eorzea first go through Melvaan's Gate for inspection. Naturally, these regulations have not pleased many of Limsa Lominsa's pirates.
Hope this helps! ^^ Let us know if you have more questions!
