This is information from the last day of PTR for patch 8.3. It could (and should!) change after posting.
Despite sharing a name with an enemy from the Cataclysm expansion, this wolf uses the same appearance as those wolves from the Legion dungeon Halls of Valor. Unfortunately, unless this is fixed on patch day or sometime after, this is ONLY tameable one time per account. This wolf is only available during the Vulpera allied race unlock quests, and is exclusive to Horde players. If you want a black worg from Legion, you will need to tame it on a Horde hunter. Alliance players will sadly have to deal with it, or pay for a faction swap and tame it that way. Once the Vulpera are unlocked on your account, this pet will be rendered unobtainable unless you buy a second account that's fully upgraded to at least BfA.
Hopefully this information is rendered obsolete and this model becomes available elsewhere, but as it stands, this is the only case of a tameable black worg with the model from Legion.
EDIT: As of live (January 14th), this is still unfortunately true. You only have ONE chance to tame it. If you don't, or abandon it later, you're screwed out of the second best Legion wolf until Blizzard fixes that.
Great news for those of you who missed the opportunity to tame this pet while you were on the Vulpera quest line - it can still be tamed via Party Sync!
Simply group up with someone who is still actively on the Vulpera quest line and in the Twilight Highlands zone. Have them use Party Sync and you will be able to phase in and tame it! If you don't have any friends or guild mates who can help you out, you can whisper random players who are in Twilight Highlands and ask if they'd be willing to group up with you.
I thought I had missed the opportunity myself to tame this beauty (it has many similarities to Fenryr). But it occurred to me to try Party Syncing and it actually worked! Confirmed this morning.
This worg shares a model with the black dire worgs in halls of valor, which now finally appears to be tamable since the addition of these worgs. Got my ebonclaw worg today :)
这个 NPC 能在这些地区找到：
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