You can use the following trinkets.
Masonic Charm
As a Bonus Action, you attach this charm to a weapon you are holding. When you do so, choose a number from 10-19. For 1 minute, your attacks using the weapon score a Critical Hit on a roll of that number or a 20 on the d20.
Three-Headed Coin
You give yourself Advantage on one D20 Test before you roll the d20.
Unfathomable Metal
As a Bonus Action, you reveal this trinket to a creature within 5 feet of you. At the start of each of its turns for 1 minute, the target takes 2d6 Radiant damage and then makes a Constitution saving throw against your spell save DC. On a failed save, the effect continues. On a successful save, the effect ends.