Amulet of Adaptation

This amulet is simple bronze, and it fills you with a sense of irrational stubbornness and camaraderie.  While attuned to this item, you gain the following benefits:

• You learn one language of your choice.
• Once a day, you can choose to reroll a saving throw or ability check and pick which roll to use.
• You gain proficiency with one tool of your choice.  If you are attuned to this item for a year, this benefit becomes permanent.