Fey dragon

Fey dragons are a type of dragon used by the Unseelie Court.

Appearance
Fey dragons appear serpentine, with filmy, translucent wings and elongated, slender limbs. They have frog-like faces with bulging, cloudy white eyes and rows of sharp teeth. The jaw is split, and the eyes go black when using their Dark Fire Gaze ability.

Actions

 * Dark Fire Gaze: requires a Dexterity saving throw with an unknown DC greater than 15. The Fey dragon can target multiple creatures within sight range. Creatures who fail take fire damage.
 * Multiattack: a fey dragon can make two Rend attacks, each with a 10 foot reach.

Known fey dragons
Gloamglut is the fey dragon mount of Sorrowlord Zathuda, and can be called via an ocarina-like whistle. After Bells Hells destroyed the Malleus Key in the Feywild, Zathuda and Gloamglut attacked them. When they escaped by hiding under the Harrowcall Veils, Gloamglut attempted to track them through the Sablecast Grounds. Morri attacked it, which permitted Bells Hells to evade it; Gloamglut caught up just as they exited the Fey Realm.

Trivia
The physical appearance of fey dragons matches that of the Jabberwock, and some of the attacks are similar, but Gloamglut appears to lack some abilities Jabberwocks possess, notably the ability to track those it has wounded.