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The Sensor Phalanx in Xterium — How to Monitor an Enemy Fleet

How the sensor module works in Xterium: a structure on the moon that scans alien planets and detects approaching fleets. Range by level, Dark Matter consumption per scan, and limitations. Data from the game code.

5 min Updated 2026-06-20 Mechanics Verified by the Xterium team
On this page
  1. What Is It and How Does It Work?
  2. Scanning Range
  3. Restrictions
  4. Frequently Asked Questions

The Sensor Pylon is a structure on the Moon that scans other planets and shows which fleets have departed from them and which are heading toward them. It’s indispensable for detecting an attack in advance. Below is how it works. All data is taken from the game code.

Where the data comes from. Range, consumption, and limitations are taken directly from the game engine (the War of Alliances universe). Some of the figures in the in-game help section are outdated—we present how the code actually works and note any discrepancies. The building card can be found in the Buildings section of the encyclopedia.

What Is It and How Does It Work?

  • It can only be built on the Moon. The Phalanx (listed as “Sensor Module” in the building list) is a lunar building located next to the lunar base and the teleport.
  • Displays enemy fleets. When you scan an enemy planet, you can see the fleets that have departed from it and those heading toward it—along with their estimated arrival times.
  • Each scan costs Dark Matter. One scan uses 100 units of Dark Matter.
The in-game help mentions a cost of “5,000 Deuterium”—this text is outdated. In the game code, the scan costs 100 Dark Matter.

Scanning Range

The higher the phalanx level, the farther it “sees” (in both directions along the systems within your galaxy):

Phalanx levelRange (systems in each direction)
11
55
1010
1515
2025
2535
3045

Up to level 15, the range increases by +1 per level (for example, level 7 covers 7 systems), and after that, it increases more rapidly (by +2). At its maximum (level 30), the phalanx covers 45 systems in each direction.

The in-game help mentions the formula “level² − 1”—this is a different, outdated calculation. The actual code uses the table above.

Restrictions

  • Only within your own galaxy. The target must be in the same galaxy as your moon.
  • The target is only the planet, not the moon. You can't scan an alien moon with a phalanx.
  • You cannot scan your own planet.
  • I need Dark Matter. If you have less than 100 DM, the scan won't go through.
  • Vacation mode disables scanning (this is a security measure to protect your account while you're away for an extended period).
  • The phalanx cannot see a fleet that has taken off from the moon itself—this is a well-known method of sending a fleet covertly.

Frequently Asked Questions

Where should we form a phalanx? Only on the moon. First, you need the moon and a lunar base.

How much does a single scan cost? 100 units of Dark Matter per scan.

How far can she see? It depends on your level: Level 1 — 1 system; Level 30 — 45 systems in each direction (within your galaxy).

Is it possible to scan someone else's moon? No, the Phalanx only scans planets, not moons. And only within its own galaxy.

How can I hide from her? A fleet taking off directly from the moon doesn't show any phalanx formation.

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The Xterium knowledge base is maintained by the project team; data is verified against the game engine. About the project and team →