Potion of Summon Monster
Some conjuring spellcasters have mastered the art of transferring their summoning power into thrown splash-weapon potions. During the brewing process, a creature is summoned and stored inside the potion bottle in gaseous form. Upon release, the creature behaves as if it had been called by a Summon Monster spell or similar, treating and obeying the potion activator as the summoner. For the purposes of spells and magical items that determine the caster of a spell, however, the caster will still read as the initial summoner, rather than the person who activated the potion.
The Mongrelfolk rebels use Summoning Potions containing illegally-summoned Divs in their terrorist attacks on the Noble District.