Magical gene / spots and rings

Crescents

One to four broad open arcs, the largest centred on the barrel, each thinning to nothing at both of its ends and keeping the coat colour inside its curve.

What it can come out as

Outcome	Carrying
Crescents	`Crs/Crs` · `Crs/Crc` · `Crs/n`
Coloured Crescents	`Crc/Crc`
Wild type	`Crc/n` · `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 595 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
`Crs/Crs`	Crescents	0.006% — 1 in 16,667
`Crs/Crc`	Crescents	0.024% — 1 in 4,167
`Crs/n`	Crescents	0.114% — 1 in 877
`Crc/Crc`	Coloured Crescents	0.024% — 1 in 4,167
`n/n`	Wild type	99.832%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/crescents.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.crescents`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	306 — where it sits in the one `(priority, key)` paint order
Alleles	`Crs` · `Crc` · `n`
Varies per horse	5 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built from	RINGS, 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.

Crescents

Wide arcs of a single band, a quarter to two-thirds of the way round a circle, with the coat inside the curve untouched. The largest sits on the mid-barrel and the smaller ones fall on the scapula, hip and caudal neck. Which way an arc opens is not fixed - a crescent horse has arcs facing several ways, never a row of them facing one.

the arcs, sparse and large — RINGS, painted with TOWARD

Coloured Crescents

The same marking in a colour the line carries rather than in white. Fully recessive: it takes two copies, and a single copy beside the white allele shows white. It never gives blue eyes, whatever the white form does.

the arcs, sparse and large, in colour — RINGS, painted with TOWARD

Wild type

No crescents.

Paints nothing.