The Flame Keepers' Circle Soldiers, also known as the Esoterica, are worshippers and servants of Diagon.
The Esoterica are workers of a philanthropic organization called the Flame Keepers' Circle who take donations and use them to provide humanitarian aid. Recruiting celebrities to spread their message is also common.
Aside from having access to alien technology, the cult's warriors are ninja-like fighters who use a technology that allows them to move between dimensions. They use it to teleport over short distances and walk through the air.
They stopped Ben from destroying Vilgax, whom they thought was Diagon, which is why they worshipped him.
When Diagon was released from his seal, he converts almost every human in the world into an Esoterica. Only the Ascalon-powered Ben Tennyson managed to revert them back to normal.
Powers and Abilities
Esoterica have the ability to move between dimensions and appear back to the same dimension at will. they can use this ability to also interact with something in another dimension (for example stairs) while staying in the regular dimension
Esoterica can manipulate energy for offensive and defensive purposes.