Altin's Leg of Tunneling

A long, thick, adamantine segmented spider's leg terminating in a sharp scoop-like claw.  Five times per long rest, as an action, the leg can be used to tunnel through any solid surface. As an action, choose any location within 100 feet that's connected to your location.  At the start of your next turn turn, emerge from the tunnel and gain advantage on your next attack.

Notes: Advantage: Melee Attacks, Advantage: Ranged Attacks, Advantage: Spell Attacks