Explosive seed

An explosive seed is a small bomb that explodes on impact when thrown.

Appearance
Explosive seeds are small brass spheres the size of an acorn, which contains a small amount of black powder and a clockwork trigger.

Properties
An explosive seed can be thrown up to 30 feet as an action. It detonates on impact, whereupon creatures within 5 feet of it must make a DC 10 Dexterity save, taking 1d8 bludgeoning damage, or half as much on a success.

An explosive seed can also be surgically implanted into a creature. If the creature dies, the explosive seed detonates after three rounds (18 seconds), or immediately if killed by a critical hit. This explosion destroys the body. A DC 10 Medicine check can be used to extract an explosive seed from a body using thieves' tools or a bladed weapon. Once extracted, it can be disarmed by a DC 12 Dexterity check using tinkerer's tools.

Dangerous Designs
Explosive seeds were designed in 835 PD during the War of Ash and Light by Huron Stahlmast. As part of his plans to destroy and take over the city of Hupperdook, kidnapped Nima Cinnarid and forced her to create explosive seeds. He would then implant them into his kobold minions.