Baleful Gem
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The Baleful Gem is a quest item found in a Strange Device after defeating Fidelitas, the Mourning in the Chamber of Sins Level 2 during the quest, "Intruders in Black".
In conjunction with 
Maligaro's SpikeMaligaro's SpikeMaligaro loved his tools, and took great
pains to keep them excruciatingly sharp.
, the Baleful Gem is required to gain access to the Vaal Ruins during the quest, "The Root of the Problem".