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A Barnacle surrounded by Barbs

A Thargoid Barnacle is an organic Thargoid structure that extracts resources from a planet and converts them into Meta-Alloys, a key component in Thargoid ships and technologies.[1] The main structure consists of an organic growth with a central, ribbed peak surrounded by Thargoid Barnacle Barbs. The first Barnacles were documented in the Pleiades Nebula and California Nebula in 3302, and additional sites were discovered in the Witch Head Nebula in 3305 and the Coalsack Nebula in 3306.


At first sight the central column looks very much like a regular, sea-based barnacle sitting on the ground. However, closer up, it appears to consist of a number of individual obelisks making up the structure. At ground level the obelisks do not quite meet, leaving gaps through which a more organic looking material can be seen which radiates a blue-green light. It is approximately twice the height of a Scarab SRV.



The peaks of each obelisk is coloured a creamy white, with a strange symbol visible on the side. This is currently the cause of much speculation amongst commanders with many believing it to be a reference to Barnard's Loop, an emission nebula in the Orion constellation.

Large Clusters[]

Barnacle large cluster above

A large cluster of barnacles seen from above

After September 26, 3303, CMDRs began discovering much larger clusters of Alien Structures aka "Barnacles". These clusters had grown into a roughly octagonal shape, with crystal-like formations erupting from the ground and linking them together. It is possible that these large clusters are the precursors of future Thargoid Surface Sites. It's also called a Barnacle Forest due to the large scale.[2]


Thargoid Barnacles have thus far been entirely unresponsive to all attempts at communication as well as attacks, and they are also impervious to damage. Ships and SRVs cannot directly target them, and they do not appear on scanners.

When nearby, a strange sound can be heard coming from it, which sounds similar to an Unknown Artefacts, but rather sounds more like an animal noise.[3]

Connection to Thargoids[]

Unknown Ship Barnacle Laser

Thargoid Interceptor lasers a barnacle

On June 2, 3303, CMDR Mobiusetti documented the first known interaction between a Thargoid Interceptor and Barnacles on Pleiades Sector OI-T C3-7 A 6 at coordinates -42.77, -21.70, confirming the two are related. The Unknown Ship approached one Barnacle, incapacitating any nearby ships and SRVs. The craft then rotated until its propulsion array faced and was aligned with the Barnacle, before drawing a pulsing beam of light or energy from it for a brief period. The Unknown Ship then departed as rapidly as it arrived. It is possible that Barnacles serve as refueling stations of some kind for Unknown Ships, and the Meta-Alloys they produce are fuel or repair materials for them, but this is currently only conjecture.[4]


Thargoid Interceptor Particle Cloud at Barnacles

It has been observed when a Thargoid Interceptor visits a Thargoid Barnacle site, the Barnacle releases a cloud of green "particles".[5] The Interceptor deploys a shield with a similar appearance when it receives enough damage to The Thargoid ship may need to disable its shields before it can refuel/fire the green beam at the barnacles.[5]

Barnacle Seeding[]

Ram Tah decrypted ancient Guardian logs that indicated Thargoid Barnacles were designed to extract resources from a planet and transform them into Meta-Alloys for use in the production of Thargoid ships and technologies. The Guardians surmised that for the Thargoids, seeding a planet with barnacles was an important process in preparing an area for occupation.[1] The Thargoids' seeding of a region of space that was later developed by the Guardians became the basis for the Guardian-Thargoid War.

Barnacle Matrices[]

Following the escalation of the Second Thargoid War after the battle of HIP 22460 and the subsequent arrival of the Titans, Thargoid forces began invading the bubble in late 3308. By mid-3309 (after facing stiff opposition from human forces and the newly reformed Aegis), Thargoid forces began entrenching themselves in systems featuring Ammonia worlds. Over time, small clusters of barnacle like structures began appearing on these planets.

By late 3309, many of these 'Matrix sites' had grown into vast Thargoid production sites, known as Spires. The purpose and function of these growths have not yet been determined.

Known Locations[]

Small clusters[]

System Planet Surface Coordinates Notes
Merope 5 C -26.35, -156.40 First ever Barnacle discovered on Jan. 15, 3302 by CMDR Octo86.[6]
Pleiades Sector JC-U b3-2 1 22.79, 94.08 Exhausted
Pleiades Sector JC-U b3-2 1 21.91, 96.97 Exhausted
Pleiades Sector JC-U b3-2 1 -8.80, -13.36 Exhausted
Pleiades Sector OI-T c3-7 A 6 -42.77, -21.70 First sighting of Thargoid Interceptor interaction on Jun. 2, 3303 by CMDR Mobiusetti.
Pleiades Sector IX-S b4-4 B 1 -40.46, 25.81 Exhausted
California Sector BA-A e6 Multiple sites in system
California Sector DL-Y d4 First Barnacle in the California Nebula discovered in June 3302 by CMDR Wooblytickle.[7]
Multiple sites in system.
California Sector LC-V c2-10 Multiple sites in system
Musca Dark Region PJ-P b6-1 3 First Barnacle in the Coalsack Nebula discovered in October 3306. Multiple sites in system.

Large clusters[]

System Planet(s) Surface Coordinates Notes

alias Witch Head Sector GW-W c1-4

A 4 14 sites on planet A 4

alias Witch Head Sector LC-V c2-10

84 sites in system

alias Witch Head Sector FB-X c1-11

73 sites in system

alias Witch Head Sector DL-Y d17

36 sites in system

alias Witch Head Sector HW-W c1-7

31 sites in system
Pleiades Sector JC-U b3-2 1

1: 21.3368, 91.9810
2: 21.6231, 89.0229
3: 20.1809, 86.7213
4: 19.2466, 92.0927
5: 22.8062, 94.0677
6: 21.9129, 96.9749
7: -55.7840, 102.7433
8: -57.8323, 107.4274
9: 28.4238. -34.7232
10: -9.3642, -13.0645
11: -8.7990, -13.3664 (2)
12: 9.3390, 22.4387
13: 0.9977, 25.8488
14: 2.4134, 23.5579
15: 25.3372, 25.5319 (2)
16: -59.7577, -100.9596 (2)
17: -59.7283, -100.8134
18: -58.6943, -98.2877
19: -49.6752, -93.1665
20: -23.1951, -94.0199
21: -24.6363, -94.3902
22: -21.2794, -85.6073
23: -22.4144, -85.0394
24: -63.0318, -130.8715 (2)
25: -67.3041, -106.5550

51 sites in system

1: 61.2111, -56.0105
2: 60.3882, -51.7986
3: 59.3733, -59.7278
4: 46.7283, -61.9831
5: 46.6405, -62.8999
6: 13.0023, 18.2415
7: -28.0485, 29.5102
8: -23.7905, 57.0949
9: -24.5298, 57.0327
10: -19.2437, -17.3568
11: -17.9331, -17.2734
12: -17.6204, -18.0465
13: -2.7067, -45.2754
14: -1.8683, -45.1720
15: -1.8551, -43.6217
16: 49.5343, 102.0783
17: 49.7537, 102.1620
18: 49.9904, 101.5106
19: 49.9082, 102.7219
20: 49.0655, 102.9378

Pleiades Sector IH-V c2-16 41 sites in system
Pleiades Sector PN-T b3-0 A 5

5: -4.4946, 145.6557

5 sites on planet A 5
California Sector BA-A e6 Multiple sites in system
California Sector DL-Y d4 Multiple sites in system
California Sector LC-V c2-10 Multiple sites in system
Hyades Sector AQ-Y d81 C 2 9.29, -153.98
Outotz ST-I d9-6 2 A

1: 76.23, -78.35
2: 55.30, -85.63

2 sites on planet 2 A