Jabberwocky

The Jabberywocky is a common livestock and mount within Dark Fey Adahlen communities. They are super hearty and massive, but are slow moving, and a bit dumb. They are known to bellow like elk, but much deeper and 'distorted' sounding. Jabberwocky continue to grow, even though they don't continue to age, and the most massive Jabberwockys are generally kept by the Unseelie Court specifically as war creatures.
The Seelie court tends to stay away from Jabberwockys, as Jabberwockys come from wintery and dark landscapes. Jabberwocky are herbivores despite their draconic looking apperences and sharp teeth, and eat the toughest bark from Sylvan Fruit trees. They cause much problems to orchards within the Runewilds, so even some Adahlen see them as pests.
It is hard to get your hands on a Jabberwocky, and much more likely you will have to barter for one with Adahlen who raise them, or keep them.