Amulet of the lucky frog

A silvery chain connects to a Small statuette of a smiling golden frog wearing a gold bead necklace. Each charge is a bead on the frog's necklace.

Contains up to 5 charges, at the end of a short rest restore 1 charge and at the end of a long rest restore all charges. As a bonus action or reaction you can use 1 to 4 charges or break the amulet.

Bending chance, 1 charge, as a reaction force a creature within sight to reroll a die.

Bending chance, 4 charges, as a reaction add or subtract 10 to a non-damage die, this effect will not cause a critical hit or critical Fail

Certain Fate, break the amulet, as a reaction break the amulet and the roll of a creature becomes a critical hit or critical fail.