Devil
Devils are beings of law with an immortal essence. The strongest of them often originate from celestial beings, so whoever would master devils also needs a deep understanding of celestials.1
Devils' contracts are one of the known paths by which mortals gain access to hidden powers.2
Infernal bindings
Infernal bindings are the best-known and most widely used kind of binding. Many spellcasters can learn and perform them, but only a select few are truly skilled at binding powerful devils and the lords of the Nine Hells.1
Binding a devil is a methodical process in which every step demands precision and practice. Because devils are beings of law, the binder must respect their nature and their immortal essence. Most infernal bindings call for holy or unholy sacrifices, and nearly every approach needs an infernal catalyst, usually an item infused with infernal power.1
Devils will haggle. In the rite that creates a Restless Watcher, a basic binding that many infernalists use to guard against intruders, the green flare of the ritual fire signals the start of a bargain with the devil; the usual price is two humanoid lives, but it can be talked down, and insulting the devil may raise it. Once the agreed price is paid, an infernal essence takes possession of a prepared corpse and animates it as a guardian.3
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