TheWoWDBConsidering this black Drake was added after Cataclysm, it seems Wrathion didnt manage to kill all the other black dragons.
Elite
Subjugated Drake
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This NPC appears when you enter the Frozen Sea zone, at the southern end of Path of Titans in Dragonblight.
Sabellian in Outland and the guy in Dragonblight who has you kill the Emberwyrms are both friendly.
Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
Community notes from Wowhead · 4 comments
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Level and Map Tracking
The game data tunes Subjugated Drake for levels 15 to 30, Wrath of the Lich King content.