Magical gene / magical coat genes

Suit

A band right round the base of the neck, well up onto the neck itself, with everything behind it going pale and the head, crest and lower legs keeping the coat. A third allele carries the same marking worked in greys instead of white - dark where the pale form is light, and the same number of steps.

What it can come out as

Outcome	Carrying
Suit	`Sut/Sut` · `Sut/Suc` · `Sut/n` · `Sut/Suk`
Black suit	`Suk/Suk` · `Suk/Suc` · `Suk/n`
Coloured suit	`Suc/Suc`
Wild type	`Suc/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 1,786 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
`Sut/Sut`	Suit	0.002% — 1 in 50,000
`Sut/Suk`	Suit	0.0027% — 1 in 37,495
`Sut/Suc`	Suit	0.0027% — 1 in 37,495
`Sut/n`	Suit	0.038% — 1 in 2,632
`Suk/Suk`	Black suit	0.0027% — 1 in 37,495
`Suk/Suc`	Black suit	0.0027% — 1 in 37,495
`Suk/n`	Black suit	0.0027% — 1 in 37,495
`Suc/Suc`	Coloured suit	0.0027% — 1 in 37,495
`n/n`	Wild type	99.944%

Its gene carrot

The file

common/src/main/resources/horsegenetics/genes/suit.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.suit`
Phase	magical — it adds signed colour in phase 3, after the pigment has resolved
Priority	102 — where it sits in the one `(priority, key)` paint order
Alleles	`Sut` · `Suk` · `Suc` · `n`
Varies per horse	3 values drawn once off the expressing allele copy, so a foal that inherits the copy inherits the look
Built from	AXIS, TOWARD

Why it is built this way

The black allele is the white one with the light taken out of it, and it sits one rung under white in the dominance series - so every combination that existed before it keeps the outcome it had, and only the pairs carrying Suk are new. The re-toning is a mapping rather than a repaint: every achromatic target moves into the dark end of the scale keeping its order and its spacing, and every SATURATED one is left alone, because that colour is the gene rather than its lightness.

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.

Suit

The suit line wraps the base of the neck, its back edge landing well forward of the scapula and its front edge running up onto the neck itself - but it passes under the crest rather than over it, so the topline of the neck keeps its colour the whole way. Everything behind the band goes pale, roughly half the animal, while the head, the upper neck and the crest keep theirs. The legs come back to the coat from the knee and hock down, over a soft transition rather than a line. The mane keeps its colour; the tail follows the pale field about half the time.

everything behind the suit line — AXIS × AXIS × AXIS, painted with TOWARD
the legs coming back to the coat below the knee — AXIS, painted with TOWARD

Black suit

The same marking as the white form with the light taken out of it: a single near-black tone.

everything behind the suit line — AXIS × AXIS × AXIS, painted with TOWARD
the legs coming back to the coat below the knee — AXIS, painted with TOWARD

Coloured suit

The same split, with the caudal field in a colour rather than pale. Fully recessive: two copies, and a single copy beside the white allele shows white. It never gives blue eyes.

everything behind the suit line, coloured — AXIS × AXIS × AXIS, painted with TOWARD
the legs, coloured to the knee — AXIS, painted with TOWARD

Wild type

No suit.

Paints nothing.