The second set of Celestia's units

Sisters of Vengeance: Originally formed as a group of female body guards of Queen Majesty herself, they fought and died to protect the lands of their majesty. They gained their name after Discord took the throne. (The sisters are notorious for their hate of traitors and chaos. They are kept separate from more peaceful chaos ponies.) They fight with valor and impressive skill. With the appearance of the celestial sisters, they pledged themselves to them and have fought for them ever since. They place duty and justice above all else and act as the law enforcers of the land.
Xiulcoatl: Large, fire serpents. Another creature tamed by Celestia, these serpents are almost like living gushes of molten lava, as their very presence will heat up their environment. Their black scales are extremely tough and their very blood will melt anything it touches. Even with their tough armor, they are rather quick. They can spew gouts of fire.
Celestial Guard: The bulk of Celestias army. These everyday soldiers fight and die in Celestias name. Their courage lends to their steadfast defenses and offenses against even the mightiest of foes.

Bearers of Flame: These honored few are given the task of carrying a holy relic; a Sun Spitter. This long barreled weapon contains the lifeblood and magic of Celestia herself. Bearers of Flame are chosen personally by Celestia to carry the weapon and they will never part with it again. It is considered the worst act of dishonor to lose or damage it and they will give their lives to keep it.

Adventurers: Commando units. Wearing a menagerie of exotic armor and weapons, these warriors come from far and wide for glory, honor, and a large sum of money. They can take on the largest foes {dragons even} and come out victorious.
They are sent out to fight in circumstances that would kill normal guardsponies.

-Evo