Nevinyrral’s Disk

A stone disk, about 6 inches wide, with a hole in the center. The disk appears to be made out of stone, with metal fastened onto it in intervals to form some sort of pattern. Magical energy can be felt to radiate from the disk at all times, and touching it causes an immense feeling of uneasiness in whoever does so. As an action while holding the disk, you can speak a command word, causing the disk to fill with magical energy. As it does so, the disk begins to glow, and a small sphere of magical energy appears in the center of it. At the end of your next turn, the disk suddenly bursts with evocation magic, destroying itself. All creatures within a 360 foot sphere around the disk must make a DC 30 Constitution saving throw. On a failed save, any creature in this radius is instantly killed, their bodies reduced to nothingness. On a success, those creatures instead take 30d12 points of damage; any creature reduced to 0 hit points by this damage suffers the same fate as those who fail the saving throw. All magical and non-magical items and equipment in the radius are immediately destroyed, including intelligent items, which do not get a saving throw against the blast. All magical effects within the blast are immediately ended, and any individuals affected by the blast immediately lose concentration on all spells, regardless of whether they succeed or fail on the saving throw.