Use Magic Device is a skill reflecting activating magical items. It uses the Charisma stat as a modifier
There is a long precedent for this skill both in literature (re: Cudgel) and in the game. A D20 resolution works fine, but it could be improved by having some tables or ability to produce partial successes.
Thank everyone for staying with me and commenting. Up next, a quick glance at some other skill systems and how they handle various things.