Serpent
SptSpt / nSpt
Wyrm veilhorn can have serpent mutation included for free when purchasing a custom.
Appearance
Serpent causes armored dragon-like scales anywhere on the horse, and can range anywhere from covering the entire body to just a small part.
If the scales cover the topline such as the neck, back, or tail they can also optionally cause typical dragon spines/spikes.
On bloodlines with long tails (Elwyn and Wyrm) the serpent mutation can optionally cause a spiked or arrow-like tip similar to a dragon's tail tip. This can replace tail hair, if wanted.
The scales can be any color, both natural and unnatural. Scales can show the colors and patterns of any present genes.

Serpent scales on belly
chestnut + serpent

Wyrm bloodline with serpent scales on the tail
chestnut + serpent