Am was a Force-sensitive human female who, along with her twin brother Karre, was created as a weapon of the dark side of the Force. Raised by the protocol droid B-2ON, Karre and Am were trained in the use of the dark side and equipped with prototype dark armor that used the power of a kyber crystal to strengthen their powers, and in their adolescence. 
When Am confronted Karre, he rejected his armor and attempted to escape in an X-wing Starfighter, but Am used the Force to pull the power core.