Book Of Truth

Book of Truth

Wondrous item, legendary (requires attunement by a wizard)

The pages of this tome are feather-light; when you flip through them, they always seem to stop exactly where you want them to. If you can attune to this item, you can use it as a spellbook and arcane focus. In addition, you can use an action to target a creature you can see within 120 feet and cause information about the creature to spring into being on a blank page of the book. You learn the target’s hit point maximum, current hit points, and saving throw proficiencies. The information fades after 1 minute. Once you use this ability, you cannot use it again until you finish a short or long rest.

Ref: TPKB1 p234