How to Destroy Rubble Stone Barrier in Old Water Plant in Arknights Endfield

What to know

• The Rubble Stone Barrier blocks progress in the Old Water Plant area
• It cannot be broken with normal attacks or skills
• You must use an explosive barrel found above the area
• Extra loot is hidden nearby and can be destroyed the same way

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How to destroy the Rubble Stone Barrier in Old Water Plant in Arknights: Endfield

During the Rally and Unite quest in Arknights: Endfield, you’ll eventually reach the Old Water Plant and run into a seemingly indestructible Rubble Stone Barrier. At first glance, it looks like a dead end—attacks do nothing, abilities don’t scratch it, and there’s no obvious interaction prompt.

This is a classic Endfield environmental puzzle. The solution is not brute force, but vertical exploration, ziplines, and controlled explosives. Below is a full step-by-step guide based on the in-game layout, quest flow, and the images you provided.

Quest context and location

Detail	Information
Quest name	Rally and Unite
Objective	Fix the gate of the Originium BPPC
Region	Valley IV – The Hub
Sub-area	Old Water Plant
Obstacle	Rubble Stone Barrier

The barrier is positioned along a narrow industrial walkway inside the Old Water Plant complex. It blocks access to deeper sections tied to both main progression and optional rewards.

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Why the Rubble Stone Barrier can’t be destroyed normally

The Rubble Stone Barrier is a scripted environmental object. That means:

• Weapons deal zero damage
• Elemental attacks do nothing
• Companions can’t interact with it
• There is no repair or interact prompt

The game expects you to:

• Reach higher ground
• Locate an explosive source
• Use physics (throwing) rather than combat

If you’re stuck here, you’re actually standing in the correct place—you just need to look up, not forward.

How to destroy the stone rubble barrier in Rally and Unite quest

Step 1: Find the first zipline to reach the upper level

From the barrier’s position, turn around and scan the environment:

• Look for yellow zipline anchors
• These are usually attached to metal beams or platforms
• The first zipline leads to an upper maintenance walkway

Interact with the zipline to ascend. This moves you above the blocked path and opens access to vertical traversal routes.

Tip: If you don’t see the zipline immediately, check the minimap for elevation changes—Endfield often hides solutions above eye level.

Step 2: Use the second zipline to reach the topmost platform

Once on the upper walkway:

• Move forward along the platform
• Look for another zipline leading even higher
• This second zipline takes you to the topmost level of the Old Water Plant

This area is easy to miss but crucial. It’s designed as a small puzzle zone rather than a combat area.

You’ll notice:

• Narrow metal platforms
• Industrial clutter
• Barrels and containers

This is where the solution becomes obvious.

Step 3: Locate the explosive barrel

On the topmost platform, you’ll find a destructible explosive barrel marked with warning symbols.

Key properties of the barrel:

• Can be picked up and carried
• Explodes when thrown
• Deals heavy environmental damage

Approach the barrel and pick it up. Your character will enter a throw-ready stance, with an on-screen trajectory indicator.

Step 4: Throw the explosive at the barrier

While holding the explosive:

• Carefully move back toward the edge overlooking the Rubble Stone Barrier
• Position yourself so the throw arc lines up with the barrier
• You do not need pixel-perfect aim, but distance matters

The game intentionally places the barrel high above the barrier so gravity does the work

Step 5: Throw the explosive at the Rubble Stone Barrier

Once lined up:

1. Aim using the throw indicator
2. Adjust until the arc lands directly on the stone barrier
3. Throw the barrel

The barrel detonates on impact, triggering a scripted explosion.

Result:

• The Rubble Stone Barrier shatters instantly
• The path forward is permanently opened
• No further interaction is required

If the barrel misses, check nearby—sometimes another explosive barrel spawns, or you may need to reposition.

Optional step: Destroy nearby chests for extra rewards

After destroying the barrier, look around the area carefully. There are optional destructible objects, including sealed crates and chests.

Using explosives on these can reward:

• Protoprism
• Oroberyl
• Arms Inspector / upgrade materials
• Combat or exploration records

This is not required for the main quest, but it’s highly recommended, especially early in the game when Oroberyl and crafting items are scarce.

Rewards you can obtain in this area

Reward type	Notes
Oroberyl	Used for summons
Protoprism	Crafting and progression
Arms Inspector items	Gear enhancement
EXP	Authority and operational progress

These rewards are tied to exploration, not combat, reinforcing Endfield’s puzzle-driven design.

Common mistakes players make here

• Trying to attack the barrier directly
• Ignoring vertical paths and ziplines
• Missing the second zipline entirely
• Throwing the barrel from too low a position
• Leaving without checking optional chests

If you feel stuck, the answer is almost always higher ground.

Why this puzzle matters later

This Rubble Stone Barrier is one of the first times Endfield teaches you that:

• Environmental destruction is contextual
• Explosives are puzzle tools, not weapons
• Exploration rewards observation, not speed

Later regions reuse this logic with:

• Heavier barriers
• Multi-step explosive chains
• Timed throws

Learning it here saves frustration later.

Key to destroying the Rubble Stone Barrier

The Rubble Stone Barrier in the Old Water Plant is less about destruction and more about understanding Endfield’s level design philosophy. If something won’t break, the game wants you to think spatially—look up, move around, and use the environment itself as your weapon.

Once you know what to do, the solution takes less than a minute, and the rewards make the detour more than worth it.

If you’re following Rally and Unite naturally, don’t rush past this section. A single explosive barrel here can open both the main path forward and a pocket of valuable early-game loot.

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