Lostvein: The Sunken Vestiges is a third-person action-adventure game centered on diverse playstyles and free exploration. Across a vast continent, players can explore ancient ruins, visit towns and villages, gather materials, and craft through alchemy—experiencing an adventure woven from combat, exploration, and puzzle-solving.

The story begins with an unexpected incident that links the protagonist to a mysterious phenomenon known as the “Vestige.” To uncover the truth behind this connection, players take on the role of a novice adventurer and embark on a journey across the land, visiting scattered ruins and settlements while gradually revealing the secrets of The Sunken Vestiges.