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Please don't feel silly for asking. It's not a common thing in the world or in the game.

Gulastra Plume is a hidden gene; it doesn't show up on the gene test. It is based on a pattern shown by offspring of the real-life Arabian stallion, Gulastra.

The horse at the left of the top row on this page shows Gulastra Plume in a real horse.
https://www.pinterest.com/pin/203506476883064590/

Bay-based (bay, buckskin, brown) horses that carry two copies of the gene will show a lightening of the tail from the bottom to white or light gray. Buckskins with a single copy of the gene (in the game only) will show some minor lightening of the tail and a few white strands in the mane.

An example of Gulastra Plume from the game.

Clear as Day

That's pretty neat actually! Thank you both :)

Is it something that can occur in other colours like chestnut as well?

Ah, okay. Thanks!