You were raised in the sludgy swamps, and are used to moving through boggy terrain.
Benefit: You can swim through a deep bog at up to half your speed as a move action, instead of the normal quarter speed. Failing a swim check while in a deep bog doesn’t cause you to go underwater, even if you fail by 5 or more, though such a failure still results in a lack of progress.
Pathfinder Player Companion: Kobolds of Golarion. © 2013 Paizo Publishing, LLC; Authors: Tork Shaw, Mat Smith, and Jerome Virnich.