The emergency klaxons blared, painting the Old Factory in Valley IV Hub Base with streaks of frantic red. A young engineer, barely old enough to shave, stared at the Originium Refining Unit’s control panel as numbers spiraled out of control. Failure wasn’t an option; the entire facility depended on his next move. Reaching this location in Arknights Endfield kicks off the “Cog in the Wheel” quest, a pivotal moment in the main campaign.
The quest presents you with a clear objective: stabilize the factory by shutting down a dangerously unstable Originium Refining Unit. To do this, you’ll need to repair a critical Power Nexus. The fate of the workers, and perhaps more, rests on your shoulders. Let’s examine each step to complete this quest.
Starting the “Cog in the Wheel” Quest in Arknights Endfield
Ever notice how requests for help often come when you’re already swamped? The “Cog in the Wheel” quest begins immediately after your conversation with Director Qin during the “Base Revisited” quest. Qin, buried under a mountain of responsibilities, will ask for your assistance. Your next stop is the factory. Speak with the workers there to advance the quest.

Arknights Endfield: “Cog in the Wheel” Quest Walkthrough
There’s always a human element to any crisis, isn’t there? Upon arriving at the Old Factory, you’ll hear from the workers about the unstable Originum Refining Unit. Your first task is to locate two injured workers using the quest marker. After checking on them, proceed to the disaster zone. Approaching Lykor will trigger a brief cutscene.

Next, you’ll interact with the refining unit, bringing up the Power Nexus interface. Here, the quest transforms into a mental exercise.
What do I need to know about the Power Nexus puzzle?
The puzzle is your gatekeeper. To successfully shut it down, you will need to manipulate components within the interface. It’s a bit like defusing a bomb, where one wrong move could spell disaster.
- You’re given two components to place on the main grid.
- Rotate the first component once and place it on the left grid.
- Rotate the second component twice and put it on the empty grid above.

What happens after I solve the Power Nexus puzzle?
Success! Once the unit is offline, your final step involves speaking with Lykor and Laeya. This wraps up the “Cog in the Wheel” quest. The rewards will automatically appear in your inventory.
What other quests build on “Cog in the Wheel?”
Think of this quest as a stepping stone. The skills and insights gained here will ripple outward, affecting your approach to later challenges in Arknights Endfield. Each solved puzzle, each conversation, prepares you for the escalating stakes ahead.
The dust settles, the alarms cease, and the Old Factory returns to a semblance of order. But the experience lingers. Will you carry forward the lessons learned, or will the next crisis catch you unprepared?