In Mega Man ZX, what are the powerful ancient artifacts called?

The powerful ancient artifacts in Mega Man ZX are called Biometals.

Biometals are living artifacts that contain the characteristics and powers of important figures from the Mega Man universe. Humans can use them to perform a “Megamerge,” transforming into armored warriors with specialized abilities.

The game introduces Model X, based on Mega Man X, and Model Z, based on Zero. When their powers combine, the protagonist becomes Mega Man Model ZX. Other Biometals draw on the Four Guardians from the Mega Man Zero era, while the mysterious Model W represents a central threat.

Biometals are easy to confuse with Force Metals from Mega Man X: Command Mission, Battle Chips from MegaMan Battle Network, or Cyber-elves from Mega Man Zero. Those technologies and beings belong to different subseries and do not name ZX’s ancient artifacts.