Tartaros Herd, or otherwise known just as Tartaros, is a group of highly skilled and powerful hybrid ponies- whether it be half Dragon, half Demon etc. It is generally open to new members however only with acceptance of the groups Master: Thunder Gray, a half demon. It is currently rather small, yet extremely powerful and able to cause anarchy wherever they please, especially with the witch-crafted: Elements of Anarchy, in which currently each member posesses one. Tartaros consists of (at this time) 4 members.
Tartaros' Hiearchy has only 3 ranks, Lord, Agent and Thug. The Lord currently is Thunder Gray, the known agents are Mistress Umbra, Glow Arbiter and Rogue Arbiter, while the Thugs are yet to me acquired.