Gambler's Doubloon

The Gambler's Doubloon is a magic coin, which was given to Daniel Crowmer by Tymora, after she saved him from death during his fight with the Abominable Yeti.

Description
The Gambler's Doubloon is a shining golden coin, slightly larger than a gold piece. The heads side is emblazoned with an image of Tymora's face, while on the tails side is the image of a crow.

Powers
The user can, instead of rolling a d20 on an attack roll or ability check, flip the doubloon. The player flips a coin. On a heads, the roll is a 20. On a tails, the roll is a 1. After this feature is used, it cannot be used again until the next dawn.