- "Proceed hero, into terror's lair. Know that Diablo's innermost sanctum is hidden by five seals. Only by opening each of these five seals, can you clear your way to the final battle." -- Hadriel
The Chaos Sanctuary, also referred to as Terror's Lair by Hadriel, is the unholy cathedral of the Lord of Terror himself. Inside the Sanctuary, Diablo rules the Burning Hells from its innermost sanctum, a special seal located in the middle of the Sanctuary. This sanctum is hidden by five additional seals however, and the sanctuary itself is filled with numerous elite hellspawned demons.
In Diablo II, players who seek to destroy Diablo must enter his Sanctuary and open all five seals in order to clear their way to the final battle.
Three of the five seals release a super unique monster with a group of boosted minions. These are:
- The Infector of Souls, a unique Venom Lord
- Lord De Seis, a unique Oblivion Knight
- The Grand Vizier of Chaos, a unique Storm Caster
Breaking the last seal while all the super uniques are slain will kill off the rest and summon Diablo.
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