Undines are planetouched native outsider races with a connection to the elemental plane of water. This means that they are obviously great in aquatic environments, but they’re also not terribly strong. Their bonuses to Dexterity and Wisdom give them an edge at classes like the Rogue and divine casting classes. Undines might actually be my least-favorite race in the whole game, UNLESS you’re playing in an underwater campaign.
Ability Scores: +2 Dexterity, +2 Wisdom, -2 Strength. The boosts to Dexterity and Wisdom make undines naturally sneaky and excellent at divine casting. With a penalty to Strength, melee builds are tougher, though you can still make a great Dex-based Magus or Monk.
Type: Undines are outsiders with the native subtype, so just like the other planetouched races they can’t be affected by spells and effects that target humanoids, such as enlarge person and charm person, so this is a double-edged sword. .
Size: Undines are the same size as humans.
Speed: Undines have the same base speed as humans on land, and they also have a natural swim speed of 30 feet, which can come in very handy if you fall in a river, or if you’re playing a pirate-themed campaign that involves ships.