Wondrous item, rare (requires attunement)
A Matrushka doll consists of a wooden effigy about a hand’s span tall. The figure is hollow, and within it rest 3 smaller figures. Each doll is smaller than the previous one and fits neatly within the next larger one.
The owner of a Matrushka doll can use her reaction to reroll a failed save. With each use, the smallest doll inside is consumed. When the last doll inside is consumed, the outer shell turns to dust.