Weapons change at the Daily Reset every day.

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Location: Sorrow’s Harbor, Moon
About: Altars of Sorrow is a guardian-initiated activity that can be triggered as a Public Event in the Sorrow’s Harbor on the Moon similar to Escalation Protocol and Blind Well, where a team of Guardians must kill waves of Hive and Nightmares. There are five tiers of increasing difficulty and teams engage a final Nightmare boss at the end of their chosen tier, ending the event (Source: destinypedia.com). The final Nightmare boss can drop the weapons listed below, which change daily at Reset. Only one weapon drops per day, make sure to check the schedule to find out which weapon is dropping.
Schedule: View the schedule below or here.
MORE INFO: This activity is a Legacy activity and no longer rewards Powerful Gear. Only one weapon drops per day and changes every day at the daily reset time, check the schedule to make sure which weapon is dropping. You may also confirm what the weapon is each day at r/DestinyTheGame if this page is incorrect or not updated.

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ALTARS OF SORROW WEAPONS
Only one weapon rotates each day and can drop from the final boss.
NOTE: Premonition can drop from the Pit of Heresy Dungeon.

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GUIDES
Destiny 2: How to Beat Altars of Sorrow Public Event & Final Boss; Tips & Tricks by twinfinite.com
Destiny 2 – Altar of Sorrows Guide – How To Get Access To The Pit Of Hersey Dungeon by gamepur.com
Destiny 2: Altar Of Sorrows Guide by thegamer.com
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ALTARS OF SORROW SCHEDULE:
Date | Possible Reward |
6/8/2021 | Blasphemer (Shotgun) |
6/9/2021 | Apostate (Sniper) |
6/10/2021 | Heretic (Rocket Launcher) |
6/11/2021 | Blasphemer (Shotgun) |
6/12/2021 | Apostate (Sniper) |
6/13/2021 | Heretic (Rocket Launcher) |
6/14/2021 | Blasphemer (Shotgun) |
6/15/2021 | Apostate (Sniper) |
6/16/2021 | Heretic (Rocket Launcher) |
6/17/2021 | Blasphemer (Shotgun) |
6/18/2021 | Apostate (Sniper) |
6/19/2021 | Heretic (Rocket Launcher) |
6/20/2021 | Blasphemer (Shotgun) |
6/21/2021 | Apostate (Sniper) |
6/22/2021 | Heretic (Rocket Launcher) |
6/23/2021 | Blasphemer (Shotgun) |
6/24/2021 | Apostate (Sniper) |
6/25/2021 | Heretic (Rocket Launcher) |
6/26/2021 | Blasphemer (Shotgun) |
6/27/2021 | Apostate (Sniper) |
6/28/2021 | Heretic (Rocket Launcher) |
6/29/2021 | Blasphemer (Shotgun) |
6/30/2021 | Apostate (Sniper) |
7/1/2021 | Heretic (Rocket Launcher) |
7/2/2021 | Blasphemer (Shotgun) |
7/3/2021 | Apostate (Sniper) |
7/4/2021 | Heretic (Rocket Launcher) |
7/5/2021 | Blasphemer (Shotgun) |
7/6/2021 | Apostate (Sniper) |
7/7/2021 | Heretic (Rocket Launcher) |
7/8/2021 | Blasphemer (Shotgun) |
7/9/2021 | Apostate (Sniper) |
7/10/2021 | Heretic (Rocket Launcher) |
7/11/2021 | Blasphemer (Shotgun) |
7/12/2021 | Apostate (Sniper) |
7/13/2021 | Heretic (Rocket Launcher) |
7/14/2021 | Blasphemer (Shotgun) |
7/15/2021 | Apostate (Sniper) |
7/16/2021 | Heretic (Rocket Launcher) |
7/17/2021 | Blasphemer (Shotgun) |
7/18/2021 | Apostate (Sniper) |
7/19/2021 | Heretic (Rocket Launcher) |
7/20/2021 | Blasphemer (Shotgun) |
7/21/2021 | Apostate (Sniper) |
7/22/2021 | Heretic (Rocket Launcher) |
7/23/2021 | Blasphemer (Shotgun) |
7/24/2021 | Apostate (Sniper) |
7/25/2021 | Heretic (Rocket Launcher) |
7/26/2021 | Blasphemer (Shotgun) |
7/27/2021 | Apostate (Sniper) |
7/28/2021 | Heretic (Rocket Launcher) |
7/29/2021 | Blasphemer (Shotgun) |
7/30/2021 | Apostate (Sniper) |
7/31/2021 | Heretic (Rocket Launcher) |
8/1/2021 | Blasphemer (Shotgun) |
8/2/2021 | Apostate (Sniper) |
8/3/2021 | Heretic (Rocket Launcher) |
8/4/2021 | Blasphemer (Shotgun) |
8/5/2021 | Apostate (Sniper) |
8/6/2021 | Heretic (Rocket Launcher) |
8/7/2021 | Blasphemer (Shotgun) |
8/8/2021 | Apostate (Sniper) |
8/9/2021 | Heretic (Rocket Launcher) |
8/10/2021 | Blasphemer (Shotgun) |
8/11/2021 | Apostate (Sniper) |
8/12/2021 | Heretic (Rocket Launcher) |
8/13/2021 | Blasphemer (Shotgun) |
8/14/2021 | Apostate (Sniper) |
8/15/2021 | Heretic (Rocket Launcher) |
8/16/2021 | Blasphemer (Shotgun) |
8/17/2021 | Apostate (Sniper) |
8/18/2021 | Heretic (Rocket Launcher) |
8/19/2021 | Blasphemer (Shotgun) |
8/20/2021 | Apostate (Sniper) |
8/21/2021 | Heretic (Rocket Launcher) |
8/22/2021 | Blasphemer (Shotgun) |
8/23/2021 | Apostate (Sniper) |
8/24/2021 | Heretic (Rocket Launcher) |
8/25/2021 | Blasphemer (Shotgun) |
8/26/2021 | Apostate (Sniper) |
8/27/2021 | Heretic (Rocket Launcher) |
8/28/2021 | Blasphemer (Shotgun) |
8/29/2021 | Apostate (Sniper) |
8/30/2021 | Heretic (Rocket Launcher) |
8/31/2021 | Blasphemer (Shotgun) |