Traits

[Item: Sail Shell]

A large singular semi-rigid fin that forms in a smooth curve, supported by cartilaginous spokes. It's thought that this is a feeler mutation, due to its consistently simplified shape.
Leeches with this trait have reduced mobility, although those with a sailfin tail are incredibly powerful swimmers for short bursts.

Note: One sail per trait application! Sails on the head do not count as horns.