"Atop rocky crags dwelleth the aldgoat, wondrous hardy and woolly, and ravenous insomuch that hardly he may have provender enough to sate his ne'erending hunger, for nigh all men know the land's stark mountaintops were once leafy knolls ere the aldgoat came, or so telleth the Ishgardian myth, Tale of Bridges.
The male aldgoat hath a rough shapen head, as it were the head of a statue, and sinewy nape for to shield 'gainst whetted fangs. From his temples groweth forth twin crook'd horns, right strong and sturdy, with which he rendeth most cruelly.
These are not absent the female, yet hers are tiny, for her disposition tendeth toward meekness and mildness. It is said witches use the horns and perform many witchcrafts therewith.
While the aldgoat is young and tender and fair of disposition, he may yet be made tame and obedient. If however unbroken by his second Spring, he is lost and men he shall shun e'ermore."

Modern Adaptation:

Aldgoats are denizens of rocky, mountainous regions, indiscriminately eating any vegetation they happen across. They have thick, wooly coats and sharp horns, though the horns of the males are markedly larger than those of the females. These horns are highly sought after for their potency in various magical endeavors. The aldgoat also has a protective ring of tough flesh around its necks, which serves to defend against the bites of predators. Aldgoats can be successfully domesticated and raised as livestock provided they are broken before their second year.