Awakened Melee Stone

This pulsing red stone imbues the bearer with immense martial capabilities. It must be embedded into the flesh of the bearer for its effects to activate. Embedding requires holding the stone to exposed skin for five minutes and passing a DC20 Con check. Upon success, the user may add 10 to up to three hit rolls per long rest, or choose to make any roll of 15 on a d20 a critical once per long rest.