self-moving musicorum

When(as a bard only) you would go to roll for a ability check(performance). You have the chance to roll a d20. After you roll the d20 depending on what number you roll the effect is as follows,

Roll 1: You lose 10 off of the performance dice roll that you make 

Roll 2-6: You lose 5 off of the performance dice roll that you make

Roll 7-9: You lose 1 off of the performance dice rill that you make

Roll 10: You gain nor lose nothing off of the performance dice roll you make

Roll 11-13: You add 1 to the performance dice roll you make

Roll 14-19: You add 5 to the performance dice roll you make

Roll 20: You add 10 to the performance dice roll you make

(Can only take once per short rest)