History of Altars of Sorrow: Waves upon Waves

Triumph: "Complete waves of Altars of Sorrow." The data has no stated target; check the in-game tracker. Each tier/wave you finish in Altars of Sorrow should count.

== How to complete ==

• Start or join events in Sorrow's Harbor on the Moon and clear tiers; chaining events is the quickest route.
• Keep the Nightmares from sacrificing so the timer lasts through the tiers.

Altars of Sorrow is a player-started horde-style public event in Sorrow's Harbor on the Moon, introduced with Shadowkeep. Teams defend altars against waves of Hive and Nightmare enemies (tiers I-V) before a boss tier. The event has not been confirmed here as currently active; sources I opened (Destinypedia, the D2 Wiki, TechBloat) describe the Shadowkeep-era version, and the triumph text refers to "Tier V" and "phases", so check in-game whether it is still available or has been retired or reworked.

== The event in brief ==

• Tiers I-II: 4-5 Nightmares. Tier III adds shielded Wizards that need cleaver drops from Accursed Swordbearer Knights. Tiers IV-V have 7-8 Nightmares and more Wizards.
• The timer starts at 60 seconds. Killing regular Hive adds 1 second, and a Nightmare that reaches an altar and sacrifices itself costs 10 seconds (sources disagree on whether killing a Nightmare also adds time; Destinypedia says it adds 10).
• The final tier is a boss rotating daily: Nightmare of Phogoth (drops Blasphemer), Nightmare of Taniks (drops Apostate) or Nightmare of Zydron (drops Heretic). The boss becomes immune periodically and spawns Nightmares that must be cleared or they sacrifice at the altar.