Wondrous Item, rare
The crystal is a blue color, emits a blue hue and fits in the palm of someone's hand. Despite it being hard, it is able to be crushed. When someone crushes the crystal, the person is taken back to the space they were last turn and heals any health that was taken after their last turn. When crushed, the crystal reforms back into their hand as though it wasn't destroyed. The crystal has 3 charges and regains 1d3 charges at dawn. Once the crystal is out of charges, it is unable to be crushed as though it is incredible strong and the blue hue is gone until a charge returns.
I forgot to add that if next to an enemy, it doesn't activate opportunity of attack.