From what i can tell, the closest in-game weapon to what they're using is the Brunnhildar Harpoon, which has an in-built enchantment effect
Elite
Highmountain Warbrave
Highmountain Warbrave is an Elite Humanoid, level 10 to 45.
Details
Highmountain Warbrave at a Glance
FactionHighmountain Tribe
Level and Map Tracking
The game data tunes Highmountain Warbrave for levels 10 to 45, Legion content.
In the Client Files
Standing toward other monstersHostile
Also Highmountain Tribe Humanoid in the current client data
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Game Data
Creature ID97498
Display ID63943
Faction template2786
Content tuning333
Held item IDs34058
Related
Background
Art © Blizzard Entertainment. Fan reference, not affiliated.