A magical coin that appears as a single Gold Piece and is indistinguishable from a normal coin, except that when not exposed to the light, this coin will glow a faint golden yellow. To use this coin, flip it as a bonus action and call what face it will land on. If you call correctly you will gain a critical success on the next ability check, skill check or saving throw you make. If you call incorrectly you will suffer a critical failure on the next ability check, skill check or saving throw you make. You can use this coin a number of times equal to your Proficiency Bonus each day.

spell