You have the ability to create a slow-moving fog bank by converting moisture into vapor using your specialized lungs or gills.

MP Cost: 2

Benefit: Once per day, as a move action, you can create a bank of fog by exhaling water vapor. The fog spreads out from your position at a radius of 10 feet per round you spend concentrating on this ability, to a maximum radius of 200 feet. The fog obscures all vision, but not darkvision, beyond 5 feet. A creature 5 feet away has one-half concealment (20% miss chance), and creatures further away have total concealment (50% miss chance, and attackers cannot use sight to locate a target). In still conditions, the cloud persists for as long as you concentrate, plus 10 rounds. A moderate wind disperses the cloud in 4 rounds, and a strong wind disperses it in 1 round.