Bag of Dragon's Teeth

A small, leathery pouch stitched from what might have once been a wyrm's tongue. The teeth inside rattle like dice in a gambler's palm - except that these aren't ivory; they're obsidian shards, warm, humming with buried rage. 

Activation: Bonus action—reach in, grab a handful, toss them. (One use per short rest.) Effect: The teeth hit ground and erupt into Dragon's Tooth Kobold Skeletons. Roll 1d10 skeletal kobolds. Duration: 1 hour or until killed, scattered, or the bag's yanked away. When the kobold skeletons die, they crumble into tiny piles of ash and teeth (four teeth per skeleton), which can be recovered to recharge the bag. At dawn, the bag gains two teeth.