You can also obtain one as a quest reward through the questline [The Great Expedition] First Sailboat into Oquilla’s Eye. The first quest in the chain, Vigorous Velia, can be accepted with a Lv. 50 or higher character while in the territory of Balenos.

(The quest that gives the ship as a reward is called Jarette's Support.)

 ▲ Epheria Sailboat (Left) Frigate (Right)

The Epheria Sailboat and Epheria Frigate is the second stage of the Carrack upgrade process.

These two ships offer differing types of Carracks that they can ultimately be upgraded to, so this is the point where an important choice should be made.
 
Epheria Sailboats allow you to eventually craft a Balance Carrack or an Advance Carrack.
The Balance Carrack has evenly distributed stats, while the Advance Carrack is the ideal ship for bartering, as it can carry more weight.

Register the ship you wish to upgrade at a wharf via the Wharf Manager. Then, use the Upgrade menu and add all the materials required to upgrade the ship.

Note that you cannot upgrade your ship in the following circumstances:

- A piece of equipment is not at max durability.

- The ship has equipment equipped or has items in its inventory.

- A Sailor is on board the ship.

The equipment required to upgrade the Bartali Sailboat to an Epheria Sailboat or Epheria Frigate can be purchased from Philaberto Falasi in Port Epheria, and can be enhanced with Black Stone. When enhancement fails, max durability of the equipment will decrease. Max durability can be restored by purchasing more of the same equipment to restore the original’s max durability.

▲ Port Epheria’s Philaberto Falasi

Sailboats and Frigates can both be improved, and once they are, you can use skills such as Volley and Focus Fire.

Volley allows you to move cannons to the left or right and fire them while moving. Focus Fire allows you to fire multiple shots quickly at a location of your choosing.

There are certain upgrade materials that can be obtained by defeating sea monsters. Defeating these monsters will also help you obtain materials necessary for the next step of the upgrade process.

As with the upgrade from a Bartali Sailboat, you can improve your ships via any wharf manager.

 
However, keep in mind that improving your ship does not change the materials required to upgrade them to a caravel or galleass.

Once you have obtained a Epheria Sailboat or Frigate, you can work towards upgrading them to a Caravel or Galleass.

▲ Epheria Caravel (left), Epheria Galleass (right).

Epheria Caravels (left) have 30 slots, and can carry 10,000LT, making them great trading and bartering ships.

On the other hand, Epheria Galleass have 4 cannons on each side, totaling to 8 cannons, which makes them superior in naval combat.

Both can be improved to obtain the sailing skill Volley, allowing you to fire cannons while moving, or Focus Fire skill which fires multiple shots quickly at a location of your choosing for massive damage.

There are certain upgrade materials that can be obtained by defeating sea monsters. Defeating these monsters will also help you obtain materials necessary for the next step of the upgrade process.

The materials required to upgrade your ship to a Caravel or Galleass are listed below.

Ravinia also offers the “Ravinia’s Ship Upgrade Log” questline you may have seen mentioned above. You can complete these quests to get ship upgrading materials you need.

 
The quests run from "Ravinia’s Ship Upgrade Log I” to “Ravinia’s Ship Upgrade Log VII”. It takes 7 days to accept these quests in order. When you complete each of these quests, Ravinia will reward you with Ravinia's Wiggly Waggly Letter. These letters can be used to accept quests from Ravinia. These quests provide upgrade materials required to upgrade Caravels and Galleasses.

The 4 pieces of equipment required to upgrade to an Epheria Caravel or Epheria Galleass can be purchased from Philaberto Falasi in Port Epheria. The equipment pieces can be enhanced using Verdant Black Stones. When using these stones to enhance ship equipment, there is a 100% chance to succeed at all levels. You will need Verdant Black Stone x55 to enhance a piece of equipment up to +10, and a total of Verdant Black Stone x220 to enhance all four of them.

Verdant Black Stones can be obtained in the following ways: