Shadow

Shadow is a breed of dire wolf known as a haste wolf. These wolves are incredibly fast, and cannot be seen while at full speed, besides a large black blur.

They are difficult to hit with attacks, and as such can potentially take down entire parties of warriors single handedly.

Shadow is infinitely loyal to Zero.

History
Shadow was owned by the Hand of Naarth, as was a minion under their control. When they discovered that the Laign Adventurers Guild was coming to thwart their plans, they sent Shadow to kill them.

Unfortunately for them, the Guild was well equipped, and managed to trip and bag the wolf with ease.

Zero had recently been given a Glowstone as a gift, and used it's abilities on Shadow, ultimately destroying it. However, Shadow became loyal to Zero, and will obey his every command.