Bag of Dragon's Teeth

Take heed now, that I may devise help for thee. When at thy coming my father has given thee the deadly teeth from the dragon's jaws for sowing, then watch for the time when the night is parted in twain, then bathe in the stream of the tireless river, and alone, apart from others, clad in dusky raiment, dig a rounded pit; and therein slay a ewe, and sacrifice it whole, heaping high the pyre on the very edge of the pit...Thereupon the spear-heads of the earthborn men shall not pierce thee, nor the flame of the deadly bulls as it rushes forth resistless. But such thou shalt be not for long, but for that one day; still never flinch from the contest. And I will tell thee besides of yet another help. As soon as thou hast yoked the strong oxen, and with thy might and thy prowess hast ploughed all the stubborn fallow, and now along the furrows the Giants are springing up, when the serpent's teeth are sown on the dusky clods, if thou markest them uprising in throngs from the fallow, cast unseen among them a massy stone; and they over it, like ravening hounds over their food, will slay one another; and do thou thyself hasten to rush to the battle-strife, and the fleece thereupon thou shalt bear far away from Aea; nevertheless, depart wherever thou wilt, or thy pleasure takes thee, when thou hast gone hence.

- Account from The Argonautica

This heavily-worn pouch contains 2d4+7 teeth within, each of a different size, shape, and source. The teeth are capped in molten gold, and endowed with various runes carved into them. Even when the bag is entirely still, the teeth can be heard chattering against each other. 
When the user sows or throws a dragon tooth into the earth, it sprouts a Spartoi Warrior (the stats of which are determined randomly by the table below) made of bone. The Spartoi is calm and obedient towards the summoner, and will fight for them.
When the Spartoi drops to 0 hit points, or if the Spartoi is still around 6 hours later, it decomposes rapidly and the tooth which summoned it is destroyed.