The Chaonion Agema is the elite military unit of Epeiros and the personal guard of the Epirote King.
Can Form Phalanx
The Chaonion Agema are the infantry elite in the Epeirotes army. They are the elite phalangite infantry, and if phalangites are simply capable of holding a line, these soldiers are more than capable. They are armed with long pikes to keep the enemy at a distance, but should the enemy get too close, they are more competent than most Phalangitai with their short swords. They should be deployed where the fighting will be hardest or the line will be most vulnerable, because they are less likely to turn and run when things get too hot than other infantry. A good phalanx commander should remember that a phalanx’ flank is always weak.
Alexandros of Epeiros may have adopted phalagitai from Phillipos and his cousin, Megas Alexandros, but the tradition of infantry such as the Hypaspistai, Argyraspides, or Hetairoi were not available to the Epeirotes, who independently created their own elite forces. The Chaionia Agemata are elite pikemen comparable to the Argyraspides.