An enchantment is a special type of Gear equipped on top of another Gear card. Enchantments commonly provide enhancement dice to the equipped Gear card's Action and Reaction entries. They are used exclusively in combat scenarios.
Enchantments come in three types, each of which corresponds to the type of Gear they can be equipped to: weapon enchantments, armor enchantments, and shield enchantments. Enchantments cannot be equipped to a type of Gear that does not match their type.
Enchantments have a level requirement provided. A PC's level must be equal to or greater than the listed requirement in order to equip the enchantment to their Gear. Enchantments typically have a Power entry as well, which is used to add magic cards to the combat deck.
Enchantments also have an Extra Effect provided, which adds some additional flavor and fun when equipping the card.
For more information, see Player's Guide Chapter 7: Gear and Wealth.