Aqueous Simple Template Graft (CR 1+)
Aliens
Aqueous creatures are native denizens of the Elemental Plane of Water or similar landless environments, able to survive both in and out of water.
Grafts: Add the water subtype graft (swim speed should equal creature’s fastest movement speed).
Traits: Amphibious; natural attacks that deal bludgeoning or slashing damage deal piercing damage instead; natural attacks that deal electricity or fire damage deal cold damage instead; if the creature is from the Elemental Plane of Water, it gains the extraplanar subtype when it isn’t on that plane.