All or Nothing Coin

On a roll you would normally use a d20, flip a coin instead. Heads is a critical success (Natural 20), tails is a critical fail (Natural 1). Can be used once per short rest.

Source: The Thieves Guild https://www.thievesguild.cc/magicitems/magic-item?id=391

Item type

Magical

Rarity

Wondrous item, common

Weight

0 lb.

Base Price

50 gp.