Having mastered your skills and nearly deciphered your fate, you are able to use it to turn any and all situations to your favor every so often.
Once per session, add a perfect d12 that auto-crits a max roll of 12 to any die pool of your choosing. If this die is chosen as your effect die and your roll was a success, it counts as a d20 effect.
This die also triggers any additional effects caused by rolling a critical die. You may deploy this to any die pool you wish, be it yours, your allies', or even your opponents or strangers.