Even in the legendary Weak Waters where a feather cannot float, as long as a Companion Spiritual Treasure evolves to a certain level, it can navigate freely within them.
The four directions of evolution also represent four different types of ships.
Without a doubt, choosing the direction of 'Bearing' is like being a Gunner or Summoner in a game, who can head toward becoming a Heavy Artillery Destroyer or an aircraft carrier.
Choosing the 'Strengthening Base' direction is like being a warrior in a game, which can develop toward a Cruiser or Destroyer.
Choosing the 'Wave-Breaking' direction is like being an assassin or Archer in a game, with the option to develop toward a speedboat or airship.
Though the names speedboat and airship seem somewhat low-end, they not only precisely describe their developmental direction but also accurately reflect the characteristics of that direction.
