Hadres

Hadres the dragonarion of The Underworld.

In Equestrian mythology, Hadres is the oldest male child of Karonios and Mim. According to myth, Hadres, Imargi and Hydroseidon defeated the Titans, and claimed rulership over the universe, ruling the underworld, air, and sea, respectively; the solid earth, long the province of Kaia, was available to all three concurrently. Because of his association with the underworld, Hadres is often interpreted by moderns as the Grim Reaper.