While adventuring through Western Grimvault, players will come across 9 rare mobs. After defeating all rares, you will complete achievement “I like it rare: Northern Grimvault” listed under Achievement » Kill » Grimvault. For some reason this area is listed as Northern Grimvault in achievement section. In the table below, you’ll find the list of all rare mobs available in Western Grimvault zone, their spawn locations, and possible loot.
 
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