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

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Kevin
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Pet ID: melvorItA:FearStronghold
Source:
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Stronghold of Fear
Drop Chance: 1 in 30 (3.33%)
Effect: +2% Maximum Hitpoints when using Abyssal Damage
Part of 100% Completion: Yes