There's not, he just summons them. That's what NRD does. It's a level one spell that has a chance to cast a higher level spell that you've written in your mage book, but it also has a chance to do something random. i.e. changing the sex of the party or summoning some birds or becoming itchy.
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For God so loved the world that he gave his one and only Son, that whoever belives in him shall not perish but have eternal life. John 3:16
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