Necklace of the World Ender (Fun)

Reference

 * Acquired in Chapter 90 "A Murder of Windows"


 * Chapter 322 "Abyssal Warfare 102"  Wisdom of Inferno is used to sense that documents are burned.
 * Chapter 347 "Kneel down" Wisdom of Inferno is used to sense enemies fire magic.
 * Chapter 527 "Victory & Mouth 3 – Go Home" Wisdom of Inferno let John sense fire by attackers.