Tome guardian

Tome guardians, sometimes incorrectly called tomb guardians, were tiny elemental creatures that were often summoned and bound by spellcasters to their most valuable tomes of arcane knowledge.

Description
Tome guardians varied in shape, some appeared humanoid, some took on other shapes, they all, however, were made out of living flames of the Elemental Plane of Fire and usually were between and  tall.

When these creatures were bound to an object, there were almost no indication of it, apart from faint dweomer radiation and warmth.

Personality
From what little was known about these tiny elementals, they never attempted to communicate with other beings but could understand common. When they were bound to an item, they had only one goal in life, to guard it, the magic also made them blindingly fearless.

Combat
When the object inhabited by a tome guardian was touched or attacked, the elemental creature made its presence known. It never attacked the object's owner, and alway focused it's attention on creatures that were trying to consume the object, such creatures as bookworms.

Ecology
Not much was known of these creatures' behavior or activities in the wild as most have only encountered them when bound to the items by magic. The binding was done to tomes of magic knowledge most often, even though it was possible to have tome guardians be bound to other items. Tome guardian binding could coexist with other protective magics, such as runes or glyphs. There have been stories about more than one tome guardian being bound to a single items, but these telltales have never been corroborated.

History
An ancient spellbook Jaluster's Orizon, had one of the tome guardians bound to the item, still defending it circa 1357 DR.