The Enchanter's Assistant - A New 'Companion' Mob

I present a concept for a new 'tamed' mob: The Enchanter's Assistant.

Books, when placed into an Enchantment Table with maximum enchantment power, have a rare chance to offer a new enchantment called Animate. Animate comes in only one level and will have no immediately obvious effect; but right clicking the book in your hand will remove it from your inventory and spawn the Enchanter's Assistant.

The Enchanter's Assistant would have two hearts of health, hover similarly to a bee, and resemble the book that hovers above the Enchantment Table. It would remain closed most of the time. It would follow closely behind the person that placed it and, when encountering a hostile mob, would flip open and spray a short-range burst of magic (using the same particles that fly from bookshelves surrounding Enchantment Tables) that deal random, negative status effects that last for five seconds each. The Assistant would be unable to kill mobs by itself- only debuff or reduce their health to a near death state.

The Assistant can be shift right clicked with an empty hand to return it to the player's inventory. Only the player that spawned the Assistant can do so. Renaming the Enchanted Book will change the name of the Assistant that is spawned from it. If the book is 'killed', the book will drop onto the floor, and will cause durability damage to the Enchanted Book, which can be repaired with Paper in an Anvil.