Apocalypse Charm

The apocalypse chime is a powerful doomsday weapon, despite its simple appearance. Only a few inches in length, this bronze chime is carved in Draconic runes, topped with a carving of a skull, and suspended on a short iron chain. The chime itself negates magic in the surrounding area by absorbing the power into itself, and storing it for later use. This item has 4 charges, which can be spent to create varying effects. If the chime has 0 charges at the end of a long rest, it automatically gains 1 charge. Your spellcasting ability for the effects of the chime is Intelligence or your own spellcasting ability, whichever is higher. Any creature other than yourself that attempts to cast a spell within 10 feet of the charm must succeed on an ability check using their spellcasting ability, with a DC equal to 10 + the level of the spell being cast, otherwise the spell automatically fails and the chime gains 1 charge.   While holding the chime, if a creature within 60 feet of you casts a spell, you can use your reaction to expend a charge and cast counterspell as a 3rd-level spell. If a spell is successfully countered in this way, the chime gains a number of charges equal to half the level of the countered spell, rounded down. You can use an action and expend 2 or more charges from the chime to cast dispel magic as a 3rd-level spell, increasing the level of the spell for each additional charge spent.   You can use an action and expend 3 charges from the chime to cast the forbiddance spell without expending a spell slot. You can use an action and expend 4 charges from the chime to cast the antimagic field spell, except that the spell automatically lasts for 1 hour, and doesn’t require concentration. While the antimagic field remains, you can use an action on your turn and expend an additional charge to extend the duration of the effect by 1 hour. While the chime has at least 5 charges, you can use an action to ring the chime and expend all charges from it, causing anti-magical force to explode outwards in a 100-mile radius centered on yourself. All creatures within the radius make a DC 30 Constitution saving throw. A creature that fails this saving throw is automatically killed, and a creature that succeeds takes 30d12 damage. The area within the radius of the effect becomes subject to a permanent antimagic field.