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Fiendish Serpent Source Book of the Damned pg. 178 While transforming into a serpent is most common among fiendish servants of serpentine demigods such as Abraxas or Geryon, worshipers of any fiend might assume this shape. Prerequisites: Bipedal body shape, non-native outsider with the evil subtype. Benefit: You slither upon a serpentine tail that has replaced your legs. This grants you a climb speed and swim speed equal to your base speed, and you can’t be tripped.

Fiendish Serpent

Source Book of the Damned pg. 178
While transforming into a serpent is most common among fiendish servants of serpentine demigods such as Abraxas or Geryon, worshipers of any fiend might assume this shape.

Prerequisites: Bipedal body shape, non-native outsider with the evil subtype.

Benefit: You slither upon a serpentine tail that has replaced your legs. This grants you a climb speed and swim speed equal to your base speed, and you can’t be tripped.

Archives of Nethys

Fiendish Serpent