Requirement: The Ability to Summon or Conjure a fiend (demon, devil, or yugoloth).
You gain a book of fiends. When you summon or encounter a fiend you can choose to imprint it into your book. Your book can hold a combined challenge rating of fiends equal to your spellcasting modifier “safely,” however you can only call a combined challenge rating amount of fiends equal to half of your level from the book, using a fiend summoning spell that you are able to cast. If you cast it in this way, you get to choose the fiends summoned within the parameters. If you try to store a fiend after the safe limit it must make a Wisdom save against your spell save DC - the amount of levels over the safe limit in order to trap it. This save must be made every time the fiend is called out until thirty days have passed. If it passes the saving throw it is no longer trapped and is hostile to you. It dissapears after 1d4 minutes. You can release a fiend at any time, releasing its soul and allowing it to pass into its proper afterlife. The fiends conjured/bound to this book are friendly to you and will obey your commands. If you use them in a spell, you don't have to make a saving throw to maintain control.
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