Tome of Infinite Wisdom

The Tome of Infinite Wisdom is a Hardmode magic weapon which is dropped by Ogre mini-boss during the Old One's Army event. When fired, it auto-fires four high-velocity pages that don't pierce. summons a tornado that can pierce enemies, travels through one-block low roofs, lasts four seconds, and will be stopped by a wall. If used while moving on a flying mount, its pages spread out.

Trivia

 * The Tome of Infinite Wisdom's right click attack resembles the Apprentice's second ability, Tornado. It also uses the same animation as both the Forbidden armor set bonus and the Sand Elemental "Sandnado" attack.