Dry

A Monster vulnerability.
From the Book of Engoku:

Description

The creature is completely unable to use any of its Traits or Abilities if it becomes dry. If the creature is out of water, the player must keep their head wet, and replenish the water after every attack (an attack being defined by an exchange of blows with any single attacker), or any time they fall or bow. Water can be replenished from any in game source of water (water terrain, water elemental, water spells), or any real life source (water bottle, rain, snow).

The Kappa is currently the only known creature with this vulnerability.