TheWoWDBMordvigbjorn is a rare beast. He has the model of a Guardian Druid with silver/gray fur. He is found standing next to a shield, and a polearm that is lodged into the ground. There is also a pile of bones/what appears to be a corpse on his right side.
Mordvigbjorn is located inside the Runewood in Stormheim. If you are looking at your map - his spawn point is right above the second "O" in Runewood. It is right next to the cliffs that overlook the ocean.
His coordinates are aprox 72.4 49.9 in Stormheim.He does 4 abilities: Melee hit, Claw, Severing Swipe, and a Trampling Charge. The first three are a typical melee attack, and the last is a cast that if you stand in the way of will stun you for a few seconds.
Mordvigbjorn dropped x1 Unbroken Claw, x100 [currency=1220], and 1x [item=129035] (As a DH lvl 102)
Update: he also drops [item=133827]
Update: His name roughly translates into Murder Murder Bear - Cool!
Rare
Mordvigbjorn
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Random tidbit: His name roughly translates from Norwegian as "Murder Bear"
Drops [item=133827] , which upon pickup, if you hadn't started the cooking starter quest (Too Many Cooks) yet, makes [npc=102546] (Nomi) spawn to give you that quest.
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.
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Level and Map Tracking
The game data tunes Mordvigbjorn for levels 10 to 45, Legion content.
The map marks it with vignette 877, which the client hides once hidden tracking quest 38837 is complete. In game, /run print(C_QuestLog.IsQuestFlaggedCompleted(38837)) prints true when that quest is flagged for your character.