Few other common denominators exist, so the capabilities of wands vary wildly. In J. K. Rowling's Harry Potter series, the first book of which was published in 1997, personal wands are common, as necessary tools to channel out each character's magic, and they are used as weapons in magical duels, and it is the wand that chooses its owner. A wand is also present in the Children of the Red King series in the possession of Charlie Bone as well as the popular MMORPG World of Warcraft where caster classes such as the mage and warlock use wands offensively.