User blog comment:Zathronas/Speculative author: Family Tree part 2/@comment-8505132-20140911135231

From that lore Monty gave, I could tell that Cinder's weapon is a fire-based dust clothes. It doesn't look like the fire was her semblance or power of any sorts it looked more like a weapon, judged by the tribal-like designs and such after the lore was released it confirmed my suspicion but this is just a guess because, Cinder's eyes also glow when using this.