A Charm (チャーム Chaamu) is a game object that can primarily be manipulated by black cards. Charms first appeared in WX-04 Infected Selector.
Cards can be placed under your SIGNI face-down as a Charm when certain effects are used or triggered, such as the 
effect of Ariton, Fallen Annihilation. Charms can be used as a resource for the payment of effect costs, such as the effects of Ulith, Enma of Suffering, and certain SIGNI gain benefits if they have a Charm attached to them, such as Maimon, Fallen Confession. A SIGNI can only have one Charm card under it at a time.
When a SIGNI with a Charm attached to it leaves the field, the Charm is placed into the trash.
The current reminder text for Charm is:
| [Charm] (Each SIGNI can have up to one Charm card, and it is placed face-down under the SIGNI) |
