History of Altars of Sorrow: Nightmares

Triumph: "Defeat Nightmares at the Altars of Sorrow." It has no stated target number in the data I have; check the in-game tracker. Kills count by defeating Nightmare enemies during Altars of Sorrow.

== How to complete ==

• Run the event repeatedly in Sorrow's Harbor and prioritise killing Nightmares (you have to anyway to avoid sacrifices).
• Chain events back to back rather than returning to orbit (TechBloat's farming advice).

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.