A fine bayonet, - species ref; bayonet
Strung by brigands, - Brigands are thieves - rank ref.
Made abrasive by grit, - Grit is reference to her current location (Throat)
Can make a chilling weapon. - Chilling is a ref to her homeland, the Basin.
Perhaps during the masque, - Her personality indicates she wears a mask.
You would kindly stab brutes in the back?