Sever the Hedron Links Walkthrough in Control Resonant

Sever the Hedron Links is the tenth main quest in Control Resonant, and it opens the moment you finish The Hedron Link. After Dylan destroys the first link, two more have crashed into the Patterned city floating above the Oldest House, and both need to be cut off inside the Unknown.

Quick answer: Return to the Oldest House, take Roof Access to the Unknown, deploy all eight Probe Relays for Pope’s Research, then beat the Hedron Factor and Hedron Proxy bosses to sever both links.

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Get back to the Unknown from the Oldest House

The quest begins at the Oldest House in Downtown. Take the elevator one floor above Pope and select Roof Access; it brings you to the rooftop entrance you used earlier to reach the Unknown.

On arrival, activate the Oldest House Rooftop fast-travel point, the door to your left. This saves time on all future trips, and the first research balloon you need is nearby.

Finish Pope’s Research to open the route

Both links stay out of reach until you clear the Pope’s Research side mission. It sends you hunting balloons scattered across the Unknown, and each balloon lets you obtain a Probe Relay.

There are eight Probe Relays to deploy in total. Placing one creates a Gravity Well that carries you to the next floating island. Keep chaining those Gravity Wells and dropping relays until every area is reachable, then the main quest continues.

Sever the first link near the Patterned Evac Building

Travel to the southern island in the Unknown and follow the path toward the Patterned Evac Building.

Look for the floating platforms that branch off toward the island holding the Hedron Link, then jump across them and interact with the link. This drops you into the boss arena.

Fight the Hedron Factor. Early on it throws heavy enemies at you, but once its health bar reaches the blue marker it switches to spawning weaker foes while scattering mines across the floor. Stay clear of the mines, clear the enemies, and the first link is severed.

Sever the second link near the Patterned Field Office

Head to the northeastern island, close to the route that leads back toward the Oldest House. The Patterned Field Office marks the area.

Find the floating platforms pointing toward the island with the second link and jump across to reach it.

Take on the Hedron Proxy, a boss made of several large brick-like enemies driven by a central body. Let the heavy attackers charge in, then dodge at the last second to open a window to hit back. Smaller enemies join on the ground later in the fight, so keep an eye out for them too.

How to confirm the quest is complete

Defeating the Hedron Proxy destroys the second link. With both links cut, Sever the Hedron Links registers as complete in your quest log, and Dylan is free to move on to the next main mission.