Traitor

Just a random Fallout Equestria pic, taken in wartime. You dont really see much mention of any traitors to Equestria during the war. In season 3 a prime candidate for such a pony was revealed to us.

Head Cannon: Dust defected to the other side after Dash got the Wonderbolts killed during the trigger to the war. Zebras approached her to teach their own forces (Zebras using bloodwing talismans, )

As the war went on she became rather infamous, leading a group of zebras and pegasi traitors that mirrored the Equestrian Shadowbolts. Where the group lacked in technology they made up for in Zebra alchemical and shamanism enhancements.

Dust herself managed to loot a set of power armor off the corpse of a Shadowbolt. After figuring out how to use it she then augmented it with zebra enchantments creating a set of armor unlike anything else on the planet. The advanced technology of Equestria, paired with the powerful spiritual magic of the zebras.