Urthudar's Voidwalker

Urthudar's Voidwalker (Often referred to as Urthudar's Shadow) is a Voidwalker bound to Urthudar's person. While not often at his side publically, Urthudar's Voidwalker is known to appear beside him at any point, typically when Urthudar may be threatened.

The Voidwalker was obtained after experimentation with the Devouring Void. Though Urthudar was able to create a significantly smaller version of the speller (and thus easier to control), the casting of the spell still resulted in the spawning of a Voidwalker.

Urthudar eyed the thing carefully. The Voidwalker was not inclined to move anytime soon, but when Urthudar made an attempt to control it, it simply moved to his side, of its own will, and sat there like a loyal pet. Urthudar made tests in directing it to ensure it was loyal, and the Voidwalker obeyed willingly.

Testing further, Urthudar managed to bind the Voidwalker to his person, in a way that the somehow-loyal pet would know to come to him at any point that he may need the creature.