Suicide Collar

Wondrous item (nethertech), uncommon

You can touch a button on this collar as an action to activate it, causing it to explode.

Each creature within 20 feet of the collar must make a DC 14 Dexterity saving throw, taking 9 (2d8) fire damage and 9 (2d8) necrotic damage on a failed save, or half as much damage on a successful one. If the collar isn’t worn when it detonates, it deals no necrotic damage. This collar locks onto a creature’s neck. If you attempt to remove the collar from yourself or another creature, it detonates unless you succeed at a DC 17 Dexterity check using thieves’ tools.