From Pathfinder Lost Omens Cheliax, Infernal Inheritance, which isn't enabled.

Shadow Chaser

VEHICLE 6

RARE MAGICAL

Price 900 gp

Space 60 feet long, 10 feet wide, 10 feet high

Crew 1 pilot, 4 crew

Passengers 4

Piloting Check Arcana (DC 24), Sailing Lore (DC 22), or Stealth (DC 24)

AC 18; Fort +13

Hardness 10, HP 80 (BT 40)

Speed wim 40 feet (magical)

Collision 4d10 (DC 22)

Air Bubble

Frequency once per hour

Effect The pilot activates runes that generate an air bubble around the ship for 10 minutes. The thickened air allows creatures on board to breathe while the shadow chaser is Submerged and deflects projectiles, granting the vehicle a +2 circumstance bonus to AC against physical ranged attacks.

Submerge

The shadow chaser sinks 20 feet below the water's surface, becoming Concealed to all creatures and objects on the surface. This activity can be used again to return to the surface, and if the vehicle is below another creature or object, the contact is treated as a collision.

Description A shadow chaser can move above or below the water's surface, gathering information about ships and aquatic creatures using stealthy magic. Shadow chasers are designed for observation rather than direct combat, often luring pursuers into conflict with more heavily armed surface vessels.

Pathfinder Lost Omens Cheliax, Infernal InheritanceORC