Destiny 2 Echoed Warnings Act I is the first quest entry in Episode Heresy. Players will experience the first act through 21 steps of this questline, all of which require them to follow a certain path, complete activities, gain materials, and ultimately be done with the quest. Completing a seasonal questline also unlocks other activities, as they usually are locked behind story progression.
This article lists all the steps for the Echoed Warnings Act I questline in Episode Heresy.
Echoed Warnings Quest step guide in Destiny 2 Episode Heresy Act I
Prologue
Upon entering Destiny 2, head to the Quest tab, view the "Echoed Warnings" quest, and launch the mission. This will spawn you in an instance of EDZ, along with the mission titled "Espial."
Follow the marker until a second mission, "Recce," starts inside the Hive Dreadnaught. Complete every objective until the quest step asks you to head to Eris' apartment and collect a quest.

This is the part where you get the Tablet of Ruin artifact and complete the prologue. You can refer to our guide on how to get the Tablet of Ruin artifact for a clearer idea.
Accept Mission Dossier and run The Nether
After getting the Tablet of Ruin artifact, accept the quest from the Slab in Eris' apartment. Next, open the Last City map and "The Nether: Explore" in Private. Select the mission step and click on "Launch." Here, you can either enter The Nether solo or as a fireteam of three and complete objectives.
Here's what you must do:
- Complete three major objectives and defeat a final boss.
- The three objectives require you to defeat enemies, as marked by an objective marker.
- The entire run will provide 20 Revive tokens, with no health regeneration, and the Famine modifier.

Once you defeat the final boss, the objective will update, and your next task is to head to the Spine of Keres within the Dreaming City.
Spine of Keres

Follow the objective marker and head to the Spine of Keres in Dreaming City. You will encounter Sloan here, so talk to her and progress accordingly. After fighting a few enemies, the Taken eyes will be back, inflicting the "Suffocating Pain" debuff.
Keep following the marker until you arrive in front of a huge Taken Blight. Investigate and then head back to Eris' apartment.
Tome of Want

Once at Eris' apartment, interact with the Slab for the next step. Now, your task is to reach Rank 3 of the Slab and take the "Tome of Want." This item is a container that lets players purchase certain buffs for The Nether activity and attune specific weapons to target-farm them.
Meeting a familiar foe:

Spawn on the Quagmire waypoint in Savathun's Throne World, and open your map. Select the marker for the seasonal quest, and follow it. It should take you deep into the location. Ultimately, you will encounter Savathun, thus triggering a few dialogs, and a node that will let you interact.
This will trigger the next step.
Collecting 12 Data in The Nether:

Your next task is to collect 12 Skyburner's Data in The Nether. You can launch the Exploration-Private version of The Nether, and have the Wombo Detector mod equipped on your Ghost. This should help you see any chest in the activity, and mark it for you.
To get the Skyburner Data, loot the chests in The Nether, and destroy pots. Note that there is a chance for each chest to drop a Data, so based on your luck, it can take you either 12 chests, or 100 or, until you collect all of them.
Return to the Slab:

Once you have all 12 Data, return to the Slab in Eris' Flat. This should conclude Week 2 of the Echoed Warnings quest.
Accept three missions from the Slab:

In Week 3, you can play the final parts of the Echoed Warnings Act I seasonal quest. To start, head to the Slab in Eris' Flat, and accept three Legendary missions on the second page. To summarize these missions, you must head to the Moon, and defeat three Wizards in three locations. Finding them is easy, as you can track these missions on the map, and follow the marker.
Mission on Dreadnaught:
Start a new mission from the Last City map, called Kludge. This mission is straightforward, where you must go around and clear areas in the Dreadnaught, interact with a few structures, and head to the middle platform. After a sequence, escape the map to finish the step.
Return to Eris' Flat, and speak with Drifter one last time to end the questline for Act I.
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