Amphibious. The young cave fisher can breathe air and water.

Adhesive Filament. The young cave fisher can use its action to extend a sticky filament up to 20 feet, and the filament adheres to anything that touches it. A creature adhered to the filament is grappled by the cave fisher (escape DC 11), and ability checks made to escape this grapple have disadvantage. The filament can be attacked (AC 12; 5 hit points; immunity to poison and psychic damage), but a weapon that fails to sever it becomes stuck to it, requiring an action and a successful DC 11 Strength check to pull free. Destroying the filament deals no damage to the young cave fisher, which can extrude a replacement filament on its next turn.

Flammable Blood. The young cave fisher is not fully developed and is vulnerable to fire without needing to drop bellow half health first, however if it is in water this vulnerability is negated.

Spider Climb. The young cave fisher can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Claw. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage.

Filament. One creature grappled by the cave fisher’s adhesive filament must make a DC 11 Strength saving throw, provided that the target weighs 200 pounds or less. On a failure, the target is pulled into an unoccupied space within 5 feet of the cave fisher, and the cave fisher makes a claw attack against it as a bonus action. Reeling up the target releases anyone else who was attached to the filament. Until the grapple ends on the target, the cave fisher can’t extrude another filament.