Holosummoner (5e Feat)
From D&D Wiki
Prerequisites: You must be a Gem.
Through a combination of meditation and focus, you have learned to summon a second type of armament from your gemstone. Choose one weapon, armor piece, or shield. You may use an action to summon an armament of this type, and a bonus action to dispel it. These armaments follow the same restriction as your standard gem weapon listed in the race.