Former Prime lieutenant of Deathwing
Sabellian, also known as Baron Sablemane, is a black dragon, son of the black Dragon Aspect, Deathwing. He was described as his lieutenant in all things prior to the black Aspect's abandonment of Draenor.
Beyond the Dark Portal
During the black dragonflight's alliance with 's Horde, Sabellian and his brethren transported the orc chieftans , , and a small party of orcs to Menethil Harbor, on their way to retrieve the Jeweled Scepter of Sargeras. Once the artifacts were secured he followed Deathwing to the orcs' homeworld of Draenor.
Once on Draenor, the black dragons settled into the Gorgrond and Frostfire Ridge. They were not there long before they were attacked by Gruul, his offspring, and a small group of Alliance Expedition fighters. The eggs were destroyed and Deathwing was forced to flee from battle, followed immediately by Sabellian.
The Burning Crusade
This section concerns content exclusive to The Burning Crusade.
Deathwing managed to return to Azeroth, but Sabellian remained behind on Draenor — now Outland. He is a fierce enemy of and Gruul's seven sons, and hates them deeply for killing Sabellian's own people and children.
Sabellian has admitted that he counts Rexxar as one of his friends, though he has not revealed to Rexxar that he is a black dragon.
Sabellian wears the guise of Baron Sablemane. He is a level 72 (elite) quest giver located outside the Circle of Blood in the contested territory of Blade's Edge Mountains -- the land that was created as a merger of Frostfire Ridge and Gorgrond. He assists adventurers in killing two of Gruul's sons: and Goc, reverting to his true dragon form and personally fighting the latter.
Goc yells: Who dares rouse Goc from his restful slumber?
Baron Sablemane yells: It's only right that you know the name of the one who will take your life.
yells: Your name is as insignificant to me as the names of the thousands who have died under the might of Goc.
Baron Sablemane yells: Baron Sablemane. It will be on your lips as you gasp your final breath.
Baron Sablemane yells: Let us begin.
Baron Sablemane yells: Your father destroyed my children and left their bodies impaled upon the rocky blades at Dragons' End. For this, you will die! Enough of this farce. Prepare to face my full wrath!
Baron Sablemane begins emanating immense power.
Baron Sablemane transforms into Sabellian and proceeds to kill Goc.
Baron Sablemane yells: We will speak again, but away from here.
Old God's influence?
Sabellian is noticeably much less hostile than other black dragons towards non-black dragonkin, as seen how he treats the player and Rexxar (while somewhat rude, he isn't openly hostile and shows no intent to actually attack). It is possible that due to his extended period away from Azeroth (and the Old Gods) that he no longer hears the maddening whispers that plague the rest of his corrupted flight.
While the lineage pictures from Thrall: Twilight of the Aspects and The Magazine #2 list him as the son of Deathwing and Sintharia, Ultimate Visual Guide refers to him as the half-brother of Onyxia and Nefarian. It can be speculated that Sintharia is not Sabellian's mother, but it is said that only Sintharia could survive mating with Deathwing. Moreover, comparing the other lineages it does not seem to be true as in case of Malygos's child, Balacgos, the mother is clearly listed as unknown.
- Patch 2.0.3 (2007-01-09): Added.