The Jordas Precept

The Jordas Precept is a Quest involving a Cephalon in distress, who seeks help in eradicating an Infestation. Completing this quest rewards the blueprint necessary to construct the Atlas Warframe, as well as access to the boss of Eris.

Walkthrough
The quest is automatically acquired upon the player unlocking access to the planet Eris, which will prompt the following message to be sent to their inbox: "CALLING ALL CEPHALONS, PRECEPT 44 CEPHALON STRANDED. SHIP IMMOBILIZED. POWER FAILING. EXTINCTION EVENT. Please help me! Assemble this communication endpoint to establish contact."

- Cephalon Jordas

The quest must then be initiated by finding "The Jordas Precept" under Quests in the Codex, and clicking Begin.

Contact the Stranded Cephalon
The quest begins with Cephalon Jordas, the sender of the distress signal, asking for help in eradicating the Infestation that has beset him. Ordis, compelled by his protocol to assist his fellow Cephalon, offers the aid of the Tenno to assist Jordas. Jordas however laments the chances of the Tenno's success, though he mentions that they may have a chance if they can acquire Pherliac Pods. Though unaware of what a Pherliac Pod is, Ordis nonetheless asks the Tenno to acquire them. Jordas also mentions that the fossilized parts of a fallen Warframe could be found at his location, though Ordis claims that the Tenno do not work for rewards.

Harvest Pherliac Pods from Juggernauts
In order to create Pherliac Pods, players must hunt down Infested Juggernauts that can be found throughout Infested-occupied space, and harvest the parts necessary to build them. This part of the quest is not tied down to any one node, and can be accomplished in any node the player desires, so long as they can find Juggernauts and defeat them for the Pherliac Pod components. The Histo sector in Eris is one such location in which a Juggernaut is nearly guaranteed to appear, so long as the Tenno are able to defeat the Infested fast enough.

Once the player has collected all the necessary parts, they must then construct the Pods in the Foundry and await its completion.

Test the Pherliac Pods on Infested: Acanth, Eris
This mission requires that the player equip their newly-completed Pherliac Pod in their Gear.

After acquiring a Pherliac Pod, Jordas and Ordis task the player with testing the effectiveness of the Pods against Infested on an Exterminate mission in Acanth, Eris. Upon deploying a Pherliac Pod, Jordas informs the player that they require a more potent Pod stating that the Golem requires more, and tells them that he has sent them a blueprint for an irradiated Pod. Ordis later muses on Jordas' mental state, asking whether all Cephalon are fated to degrade.

Craft Potent Pherliac Pods in Foundry
After completing the Acanth mission, Jordas will send an inbox message that contains the blueprint to construct a Potent Pherliac Pod, which will need to be built. Apart from a single charge of a Pherliac Pod, the blueprint also requires three (3) Argon Crystals to craft.

Once built, Ordis extols the player's greatness, while Jordas appears eager to have the Tenno come to him.

Assassinate the Golem: Naeglar, Eris
Before embarking on this mission, players must equip the Potent Pherliac Pods in their Gear, and ensure that they are capable of using an Archwing.

The Tenno must now find the Golem in order to defeat them, which can be located in Naeglar, Eris. As the Tenno go deeper into the Infested Ship, Jordas begins to accuse the Tenno of being greedy scavengers only there for the Warframe parts, at which point Ordis begins to question Jordas' actions with foreboding, asking the Tenno what he has gotten them into.

Bugs

 * The Potent Pherliac Pod inbox message may not arrive upon completion of the Acanth mission. Logging out and logging back in, or exiting the game completely and relogging can solve the problem.