Gaming Guide

Shoring Up Defenses quest walkthrough in ARC Raiders

Objectives, required items, and rewards for Apollo's Riven Tides defense mission.

Objectives, required items, and rewards for Apollo’s Riven Tides defense mission.

by Shivam MalaniShivam Malani

Image credit: Embark Studios

Shoring Up Defenses is a Riven Tides quest handed out by the trader Apollo, focused on clearing aerial ARC threats and reinforcing makeshift fortifications along the coastline. It rolls four separate objectives into a single questline, and you only need one ARC Alloy from your stash to start it.

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Quick answer: Destroy 5 Wasps, destroy 3 Fireflies, spend 1 ARC Alloy to reinforce the Raider structure on top of any Stacking Yard crane, and board up the shuttered windows in the hotel — all on Riven Tides.

Quest requirements and rewards

Apollo gives you the Dockmaster’s Detector when you accept the quest, which you’ll use during the raid. The only material you must bring in yourself is a single ARC Alloy for the crane reinforcement step.

FieldDetail
TraderApollo
MapRiven Tides
Required item1× ARC Alloy
Granted item1× Dockmaster’s Detector
Rewards3× Barricade Kit, 3× Lure Grenade Trap, 6× Seeker Grenade
Added in patch1.26.0

The four objectives

All four steps take place on Riven Tides. They can be completed across multiple raids, so you do not need to clear everything in a single run. Bringing the ARC Alloy in your safe pocket is the safest way to avoid losing it to PvP before reaching the cranes.

Destroy 5 Wasps. These flying ARC units patrol open coastal stretches and the Stacking Yard. Heavy ammo or explosives bring them down quickly, while light ammo will struggle.
Destroy 3 Fireflies. Fireflies are the smaller incendiary aerial ARCs that appear in the same coastal zones. A ferro slug or any heavy weapon shortens the encounter and avoids burn damage.
Image credit: Embark Studios
Use 1 ARC Alloy to reinforce the Raider structure on top of any Stacking Yard crane. Climb to the top of any of the cranes in the Stacking Yard area, find the marked Raider-built structure, and interact with it while carrying the alloy.
Image credit: Embark Studios
Board up the shuttered windows in the hotel. Head into the Riven Tides hotel and interact with the highlighted shuttered windows to seal them. The Dockmaster’s Detector helps locate the exact interaction points if the prompts are not visible.

How to confirm completion

Each objective ticks off in the quest log the moment you finish it, with the standard ARC Raiders quest update notification on screen. Once all four steps are done, return to Apollo in Speranza to turn it in and collect the rewards.

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The ARC Alloy is consumed only when you successfully reinforce the crane structure. If you die before reaching it, you’ll need to source another one before re-entering Riven Tides.

Practical notes for Riven Tides

Wasps and Fireflies often spawn near the same coastal patrol routes, so pairing those two kill objectives in a single run is efficient. The Stacking Yard crane and the hotel are on opposite sides of the map, which makes splitting them across two raids reasonable if extraction pressure is high.

Keep a heavy weapon or a ferro for the aerial units, carry the ARC Alloy in your safe pocket, and plan an extraction route before climbing the crane — the top of the Stacking Yard structures is exposed and a common sightline for other raiders. Turning in the quest unlocks Apollo’s Barricade Kits, Lure Grenade Traps, and Seeker Grenades, all of which feed directly into later defensive Riven Tides content.

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