Abyssius
Drops from Supremus. A fragment of the great abyssal Supremus, Abyssius contains enough fiery essence to burn a hole right through your pocket. Magic type. Dropped this on my gnome mage...he was bigger than me and took my dinner money :(
Abyssius is a Magic pet obtained by defeating Supremus in the Black Temple raid during The Burning Crusade, with a chance to drop 
Shard of Supremus.
Guide awaiting review
Enter Black Temple raid
Travel to Shadowmoon Valley and enter the Black Temple raid instance.
Defeat Supremus boss
Locate and defeat the raid boss Supremus within Black Temple. The Shard of Supremus has a chance to drop from this encounter.
Collect the pet
Loot Shard of Supremus from Supremus's remains, which transforms into Abyssius when added to your pet collection.
