Phantim

Phantim is a level 62 elite green drake found in Bough Shadow in Ashenvale.

Phantim wanders Bough Shadow along with other, weaker dragonkin while helping guard one of the portals of Azeroth. The portal itself is guarded by Dreamstalker; it is believed to lead to the Emerald Dream.

Attacks and Abilities

 * spell nature acid 01.png Corrosive Acid Breath - Shoots a cloud of acidic breath at enemies in a cone in front of the caster, reducing their armor and inflicting Nature damage every 5 sec. for 30 sec. Stacks up to 10 times.
 * Summon Phantim Illusions - Phantim will randomly during battle summon several illusions of himself which will attack any nearby players. The illusions have 64,740 hit points each and hit fairly hard, causing even some level 80 players to have a hard time when soloing him. Rumors has it, however, that fearing the adds will make them disappear . For some reason, the spell that summons these illusions is impossible to find in any WoW-databases (such as wowhead), and thus the name "Summon Phantim Illusions" is only a presumption.

Trivia
Phantim and Dreamstalker are occasionally trained to Orgrimmar or the Crossroads. The ability to multiply himself into four dragons was unique until WotLK, however the spawns are still extremely deadly, and will hang around for a few seconds after Phantim is killed. He requires at least well geared level 75 to solo, as the spawns are punishing.

Speculation
Phantim's ability to summon multiple illusions of himself is similar to Taerar's ability to summon so-called "shades" of himself. As both dragons are found close to the portals connecting Azeroth to the Emerald Dream, along with being influenced by the Nightmare (at least Taerar is), it could mean the abilities are related.