Band of Rising Impetus

This silver ring is etched with tiny fragments of amethyst and aquamarine.
Whenever you cast the Magic Missile spell, you can choose to roll a d20 to hit for each missile instead of the missiles automatically reaching their target(s). Your spell attack for this casting gains a +1 bonus. On a roll of 19 or 20, the missile critically hits and its damage is doubled.

Notes: Value: 500gp, spellcaster