Siblings of the Abyss

-This is my first story so sorry if its bad or chapters are short-
Every single day since Lumnie had landed in Mondstadt all she has done was commision after commision, barely anybody helped her find her missing brother. One day she snapped and left Mondstadt. She was sick of just being used. One day she would get back at Mondstadt for just seeeing her as someone to do stuff for them. She would get revenge at the whole of Teyvat for using her.