Briar was youthful and beautiful in appearance. Like her distant cousin Manon, she had naturally silver-white hair. However, she and Edda dyed their hair black to blend in better with the shadows. Her eyes are neither gold nor gold-flecked.
Like her cousin Edda, she rarely spoke, never laughed and sometimes even Asterin herself couldn't detect her until she is at her throat. Both her shadows were raised in darkness and trained to blend into any sliver of darkness and listen. Briar's only show of humor is when she sneaks up on coven members & frightens them.
Briar is with the rest of The Thirteen when they train with other Ironteeth Witches in the Ferian Gap for the War Games. She serves as a shadow for Manon in an attempt to gain information about the death of Baba Yellowlegs, but comes back empty. They also tail the Yellowlegs in the Dining Hall. She is with The Thirteen when Roland Havilliard breaks into their meeting & starts harming the others.
Briar is with the host of Ironteeth witches who sack Rifthold at the beginning of the novel. When The Thirteen escape Morath, Briar stays back with Edda to help Manon escape. They take off, with six Yellowlegs witches tailing close behind. They split into twos to divide the followers. Manon and two of her Thirteen end up killing their pursuers by flying through narrow rocky pass the Thirteen had practiced in but the Yellowlegs’ wyverns can’t navigate.
Briar reunites with Manon when The Thirteen come to the aid of Aelin's forces in a battle against Maeve's Armada.
In Kingdom of Ash Briar is a loyal follower to Manon, helping her find the Crochans. She & Edda allow their hair to grow back in its natural color because it blends in with the surrounding landscape. In the final battle for Orynth, she and The Thirteen Yield and she takes Manon's grandmother with her.
When Briar takes part in the Yielding, she explodes into light instead of darkness like normal witches.