Fallout: The Traveler/Visions

A Vision is a technology built by West-Tek and the Enclave after the Great War and improved upon by the Board that only bestowed upon those who dwell in Halcyon and is only known within that region. It grants the user elemental abilities based on the element of their given Vision. Wielders of Visions are called allogenes, though this is not a widely known term.

Visions takes form of a glove that was connected through a universal port in the user’s hand. The power supply to the glove itself is delivered via thin monomolecular superconducting polymer rods, which are planted inside the marrow and the left arm. Allogenes carry their Visions on their person's hand.

In the upper left corner of the character screen, there is an icon that represents a Companions Vision, with their element denoted by the gem and their in-game major faction denoted by the decorative design around the gem, even for the characters that do not use Visions and characters with non-standard Vision designs.

Abilities
To use a Vision ability, you must first select it from your list of available spells in the Paimon-Pip/Pip-Boy and assign it to either your left or right hand. Some spells will trigger immediately upon being cast and can be maintained as long as held. Others require holding to charge the spell and releasing to cast it. Casting an ability of either form will initiate a cooldown period, varying between each Elemental Skill depletes the Traveler's AP based on the cost of the spell and will continue to do so if the spell is maintained.

The effects of a successfully cast spell will usually be aimed in whatever direction the caster is pointing or will simply become active on the caster, depending on the nature of the particular spell. Spells that don't target the one using them vary in range: some only work on touch, several are fired as projectiles, some are maintained as a short-ranged spray, and a few (primarily Master-level spells) affect everything within a certain distance of the caster. Summon and Rune spells in particular also have a maximum casting range, meaning that if you attempt to aim the charged spell too far away from you, the spell will fail upon being released.

Trivia

 * The appearance of the Vision in Fallout lore are based off the Polymer Glove from Atomic Heart rather than gemstones in Genshin Impact