Cinder Fall uses this glove to steal the power of the Fall Maiden from Amber in the episode "Beginning of the End". The glove is an enigmatic object and next to nothing is known of its nature and origins.
The glove is white, elbow long, and marked with a red symbol on the back of the hand. The symbol appears to be centered around a stylized representation of an eye.
After Amber is defeated and restrained by Emerald Sustrai and Mercury Black, Cinder takes the glove out of her pouch and wears it on her right hand. Cinder then puts her outstretched hand in front of Amber's face.
What appears to be a red portal forms in the palm of her hand, and a black and white insectoid creature with red eyes (bearing some resemblance to a creature of Grimm) emerges from the portal. The creature then squirts a black tar-like substance onto Amber's face. Strands of the substance create a physical connection between Amber and the glove, along which Amber's power appears to be transferred to Cinder. As this occurs, the black substance and the glove begin to emit a golden glow, and a large swirling black and red mass appears below Amber.
However, before the transfer could be completed, Qrow Branwen unexpectedly appears and severs the connection with a slash from his weapon. After the connection is broken, the glove and the insect dissolve into nothing. A black tattoo then appears on Cinder's back after the glove disappears. Evidently, because the connection was severed before it was complete, Cinder only possessed an incomplete part of Amber's powers, leaving Cinder with what she describes as an emptiness and burning hunger. Amber is left in a comatose state following the transfer, gains facial scars and is only kept alive through life support.
It is unknown what would've happened if the glove's process on Amber was complete. Whether or not Amber would have been killed immediately by the process or irrevocably damaged is uncertain. The fact that it dissolved after being used could mean that the glove can only be used once before it vanishes.