The Seal of Cendriane

You are bestowed with ancient knowledge from before the seasonal courts of the fey, that knowledge allows you to recall from the long history of Cendriane, potentially aiding you in your future endeavours:

• When you make an ability check that uses a skill, you can roll a d6 immediately after seeing the number on the d20 and add the number on the d6 to the check. You can use this feature once per long rest.