Za'Za can only be obtained from Superior tier strongholds. The pet will not drop on Standard or Augmented tiers.

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Za'Za
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Pet ID: melvorItA:NightmareStronghold
Source:
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Stronghold of Nightmares
Drop Chance: 1 in 30 (3.33%)
Effect: +2% Lifesteal
Part of 100% Completion: Yes