CrashFiend82
Explorer
The monk can not attack using Martial Arts with the rapier as it is not a monk weapon, also they could not make two attacks until 5th level (with extra attack) and shadow step, as both are bonus actions and you only ever get one bonus action per round. After 5th they could use shadow step (bonus action) and attack with any weapon they are proficient with twice, they would only get sneak attack on the first hit.