A Western Sea

"Most of these islands are well-known to the Histories, but our destination lies in wild uncharted reaches. We'll need Heart or Forge to survive."

- In-game text

 is an Obstacle appearing during Expeditions. Its Aspect is Peril.

Crossing
"The sea we sail is plagued by storms. The isles we seek are tucked in the corners of unmapped history. We will need Heart or Forge or both."

- When confronting the obstacle

As told by the description, Followers with or  aspects can overcome this Obstacle with a probability depending on the aspect magnitude.

We call upon the Sister-and-Witch,...
 * 1 < < 5: ... who are pearl. The Sister-and-Witch are not of the sea, but they walk beside it. Perhaps their protection will be sufficient. 30% chance of success.
 * 5 <= < 10: ... who cannot be separated. If storms strike, the Sister-and-Witch will keep our crew and our vessel in one piece. Probably. 70% chance of success.
 * 10 <= : ... who cannot be touched. Storms rise for the Thunderskin and subside for the Sister. The right words will carry us safe across the sea. 90% chance of success.

The Sailor's...
 * 1 < < 5: ... Hope. Forge-aspected followers are competent and practical, but the sea is tricksy. We will struggle to stay on course. 30% chance of success.
 * 5 <= < 10: ... Strength. We are practical souls, strong in Forge. We'll probably be fine. 70% chance of success.
 * 10 <= : ... Surety. Our Forge skills represent plenty of expertise. We'll make it through. 90% chance of success.

Success
"Wave-lashed and sea-spattered, sun-scorched and salt-stained. But here."

- Safe Across the Sea (After success)

Crossing the Western Sea will remove the Obstacle and continue the expedition.

Failure
"Another day battered by storms. We must be close. But the isles are a maddening maze, and the places we seek lie on no published chart."

- Labyrinths of Salt and Basalt (After failure)

Failing to safely cross the Western Sea will result in a 70% chance of a Follower becoming injured.