What to know
- Insider Threat is a narrative-heavy investigation quest with light combat and environmental puzzles.
- Most objectives take place in the Power Plateau, but the quest ends elsewhere.
- Dialogue choices and exploration do not branch the outcome, but they add important context.
- You must complete every interaction in order, or the quest will not advance properly.
Insider Threat is one of the more grounded and politically charged quests in Arknights Endfield. Instead of focusing purely on combat or base-building systems, this mission leans heavily into investigation, trust, and the consequences of internal sabotage. While the objectives themselves are not mechanically complex, the quest can feel confusing if you lose track of locations, NPCs, or progression triggers.
This guide walks you through the entire Insider Threat quest from start to finish, explaining where to go, what to interact with, how to handle the only major combat encounter, and why each step matters narratively. If you want to complete the mission smoothly without missing context or getting stuck between objectives, this breakdown covers everything you need.
Arknights Endfield Insider Threat quest flow
| Quest phase | Primary location | Main activity | Outcome |
|---|---|---|---|
| Initial contact | Message interface | Read Angro’s message | Quest begins |
| Investigation | Power Plateau | Meetings and dialogue | Leads to monitoring room |
| Analysis | Monitoring Room | Puzzle-solving | Gain communication consents |
| Confrontation | Old Dorms | Combat encounter | Obtain manifest |
| Resolution | Multiple locations | Final discussions | Quest completion |
This structure highlights why Insider Threat feels slower-paced than combat-heavy quests. The tension comes from information gathering rather than enemy density.
Location of Insider Threat quest
The core of the quest unfolds in the Power Plateau, a critical infrastructure zone tied to energy production and internal logistics. This location choice is deliberate. The story revolves around internal compromise, and the Power Plateau visually reinforces that theme through its industrial design, restricted areas, and surveillance spaces.
The final quest step takes you away from the plateau, reinforcing the emotional distance between truth, responsibility, and consequence.
How to complete Insider Threat quest in Arknights Endfield
Step 1: Read the message from Angro
The quest begins when you receive a message from Angro. This message acts as the formal trigger for Insider Threat and establishes the investigative tone immediately. There is no alternative way to start the quest, so make sure the message is fully read and acknowledged.
Skipping dialogue here does not break progression, but you lose important context about Angro’s concerns and motivations.
Step 2: Go to the Power Plateau to meet Angro
After reading the message, your next objective is to travel to the Power Plateau. Once there, locate Angro and initiate the conversation. This meeting frames the central issue of the quest: suspicion of internal wrongdoing.
At this stage, the quest emphasizes trust and uncertainty, which sets up the rest of the mission’s tone.
Step 3: Go to the monitoring room with Shawna and Angro
Following your discussion, you are directed to the monitoring room alongside Shawna and Angro. This location is critical, as it represents oversight and control within the Power Plateau.
The walk itself is uneventful, but do not rush the dialogue once you arrive. The conversation here introduces key narrative threads that pay off later.
Step 4: Solve the circuitry puzzle and obtain communication consents
Inside the monitoring room, you are presented with a circuitry puzzle. After speaking with Angro, the puzzle becomes interactable. Solving it is mandatory to proceed.
Upon completion, you receive two Communication Consents, which function as narrative permissions rather than traditional items. These consents are required to legally and procedurally move forward with the investigation.
This step reinforces the quest’s theme: authority and access matter just as much as physical ability.
Step 5: Go to the site of negotiations in the old dorms of the Power Plateau
With the consents secured, your next destination is the old dorms within the Power Plateau, specifically the site of past negotiations. This area feels intentionally neglected, visually contrasting with the controlled environment of the monitoring room.
The shift in atmosphere signals that the investigation is moving from theory into confrontation.
Step 6: Talk to the alert woman at the site
At the negotiation site, you encounter an alert woman. Speaking with her is mandatory, and this conversation provides firsthand perspective on the situation you are investigating.
Her dialogue adds urgency to the quest and directly leads into the mission’s only significant combat encounter.
Step 7: Defeat the Tunneling Nidwrym
After the discussion, you are attacked by a Tunneling Nidwrym, a large, tentacle-like enemy known for aggressive movement and heavy attacks.
This enemy is classified as a mid-level hostile, but its size and attack patterns can overwhelm unprepared players. Expect furious combat behavior, including double-headed strikes that require precise dodging.
You may need one or two Ultimate abilities to finish the fight efficiently, especially if your team composition leans toward utility rather than burst damage. While the enemy looks intimidating, it is not a prolonged boss fight if you manage positioning carefully.
Step 8: Obtain the purchasing manifest
Once the Tunneling Nidwrym is defeated, you can retrieve the purchasing manifest from the area. This document is the key piece of evidence tying together the investigation.
The manifest does not trigger immediate action on its own. Instead, it becomes the foundation for the next narrative step.
Step 9: Record Cost of Betrayal after the discussion
After reviewing the situation with the alert woman, you are prompted to record “Cost of Betrayal.” This act is more symbolic than mechanical, representing the formal acknowledgment of what has been uncovered.
This moment is important thematically, as it reframes the quest from investigation to consequence.
Step 10: Return to the Originium power plant monitoring room and talk to Angro
With evidence in hand, return to the Originium power plant monitoring room and speak with Angro again. This conversation closes the investigative loop and contextualizes the findings within the larger organizational structure.
Angro’s response reflects the weight of internal compromise and reinforces why the quest is titled Insider Threat.
Step 11: View Shawna’s message
After speaking with Angro, you receive a message from Shawna. This message bridges the gap between institutional response and personal reflection.
Make sure to open and read the message fully, as it is required to trigger the final objective.
Step 12: Meet Shawna at the Shattered Fringe and complete the mission
The final step takes you to the Shattered Fringe area, where you meet Shawna in person. This conversation serves as the emotional conclusion to Insider Threat.
Once the dialogue ends, the mission is officially completed.
Common issues players encounter
Most progression problems stem from missing a dialogue trigger or leaving an area too early. Always wait for quest updates before moving on, especially after conversations in the monitoring room and old dorms.
Combat difficulty is rarely the issue; misunderstanding progression logic is.
Rewards from Insider Threat quest
| Rewards | Quantity |
|---|---|
| Oroberyl | 100 |
| T-Creds | 6,950 |
| Intermediate Combat Record | 21 |
| Protoprism | 12 |
| Arms INSP Kit | 16 |
| EXP | 400 |
Insider Threat is a quiet but impactful quest that deepens Arknights: Endfield’s world-building. It rewards patience, attention to dialogue, and understanding of systemic power structures within the game’s setting.
By following each step carefully and respecting the narrative flow, you can complete the quest smoothly while appreciating its thematic depth.
