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Izaak has more of a "trick" to get what he wants.
As you can read in the characters and clans sheets, Izaak is a Ventrue, a clan that owns powers of manipulation and persuasion. On this page, he uses the discipline called "Presence" and in particular the "Convocation" power. This power allows him to summon anyone he have ever met, mortal or supernatural creature, it doesn't matter.