Magical gene / mane and tail

Auroraband

One continuous ribbon running the length of the upper body in a shallow S, combed into fine lengthwise striations, and shifting hue from cyan at the front to magenta where it curls at the back.

What it can come out as

Outcome	Carrying
Auroraband	`Abd/Abd` · `Abd/n`
Wild type	`n/n`

How each one is actually drawn - region by region, and the layers it is built from - is on the coding tab.

Crossing two of them

Finding one

About 1 in 5,000 wild horses is born showing this. That is the whole of the supply: catch one, or make one with the carrot below. Breeds set their own pools and a breed built around this gene will carry it far more often than the wild population does.

Wild pair	Shows as	How often
`Abd/Abd`	Auroraband	0.001% — 1 in 100,000
`Abd/n`	Auroraband	0.019% — 1 in 5,263
`n/n`	Wild type	99.98%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/auroraband.json — a data-driven gene, not a Java class. It is listed in the index.json beside it and registered by Genes' class initialiser at startup.

Key	`horsegenetics.auroraband`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	408 — where it sits in the one `(priority, key)` paint order
Alleles	`Abd` · `n`
Varies per horse	2 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built from	AXIS, RAMP, SPOTS, STROKES, TOWARD

What it paints

Each outcome, described the way the gene file describes it, and then the layers that draw it in the order they are painted. The prose is the part a reader checks a bake against; the list underneath is what the engine actually did.

Auroraband

A single unbroken band, never two, never a detached piece. It starts at the mid-neck level with the throatlatch, drops as it crosses the shoulder, rises again over the barrel toward the croup and falls away over the hindquarter - two inflections, a shallow S. It is narrowest where it starts and widest at the two extremes of that curve, and it ends in a hook that curls back on itself. The fill is not flat: fine discontinuous striations run along the path, densest at the core and thinning to both margins, so the band reads as combed. The upper margin is firmer than the lower, and both are irregular because they follow where the striations end rather than any outline. Colour runs continuously along it, cyan through blue and violet to magenta, saturating and brightening as it goes. Small hard white points are scattered over the whole horse, in the band and out of it alike, evenly and with no relation to it.

the ribbon, hue running along its length — STROKES × AXIS, painted with RAMP
the striations that make it look combed — STROKES × STROKES × AXIS, painted with TOWARD
white points over the whole horse — SPOTS, painted with TOWARD

Wild type

No ribbon.

Paints nothing.