Merfolk

Merfolk on Ravnica were nearly driven extinct by the growing city above the seas, but sinkholes have allowed them to resurface. Many merfolk have joined the Simic Combine and become leaders in the Guild. Characterized by scaled skin, gills, fins, and frills, merfolk are quite adept at moving through water.

-- Racial Traits
 * Ability Score Modifiers: +2 Dexterity, +2 Wisdom, and –2 Constitution.
 * Size: Merfolk are Medium creatures and thus receive no bonuses or penalties due to their size.
 * Type: Merfolk are Humanoids with the aquatic subtype. Creatures with the aquatic subtype can move in water without making Swim checks. Aquatic creatures always treat Swim as a class skill.
 * Base Speed: Merfolk have a base speed of 20 feet and a swim speed of 40 feet.
 * Languages: Merfolk begin play speaking Common and Merfolk. Merfolk with high Intelligence scores can choose from the following: Celestial, Draconic, Elven, and Goblin. See the Linguistics skill page for more information about these languages.
 * Natural Armor: Merfolk have a +2 natural armor bonus.
 * Keen Senses: Merfolk receive a +2 racial bonus on Perception checks.
 * Weapon Familiarity: Merfolk are proficient with rapiers, short swords, tridents, and treat any weapon with the word “merfolk” in its name as a martial weapon.
 * Low-Light Vision: Merfolk can see twice as far as humans in conditions of dim light.

Other Racial Traits

 * Amphibious: Merfolk can breathe both water and air.