Tritons are not a faction of a race. They got no capital city. Tritons are the lost wanderers of the world, baring an ancient and unknown curse. It is unlikely to remove a Triton's curse. Not impossible, but there is no known spells or rituals that could help a Triton getting rid of what they became.

The curse of the Triton is of unknown origins. There are many different type of ways of receiving such a curse, and there are many different deities amassing their armies by cursing adventurers into becoming merfolk. 

Tritons, however... Tritons are adventurers that were not fully affected by the Triad's Curse. Instead of becoming Darkened, or Merfolk, they became the Triton. Humanoids with blue skin, a few scales and fish-like features over their bodies, but generally, they are still human. Stuck inside of the feeling of being under the dark ocan all the time. Tritons are both humanoids and monsters. They are adventurers, abandoning the hope of every finding a place or a home to stay. Restless desire to find meaning, which keeps being unfulfilled. Their connection to the monsters, makes them understand monsters.