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

This page is up to date (v1.3.1).
Hades
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Pet ID: melvorF:UndeadStronghold
Source:
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Stronghold of the Undead
Drop Chance: 1 in 250 (0.40%)
Effect: +2% Damage to Monsters in Combat Areas
Part of 100% Completion: Yes