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Map Basic Data Planetary Image
px Name: Talassar Unknown.jpg
Segmentum: Ultima Segmentum[6a]
Sector: Ultima Sector[6a]
Subsector: Ultramar[6a]
System: Unknown
Population: Unknown
Affiliation: Imperium
Class: Adeptus Astartes Homeworld, Ocean World
Tithe Grade: Unknown

Talassar is an Imperial ocean world, located in the Realm of Ultramar in the Ultima Segmentum.[1][2]


During the Shadow Crusade, the planet was assaulted by the Word Bearers.[4]

Later, the great horde of Orks descended on the main continent of Talassar, Glaudor, threatening to destroy cities there. Following the protocols of the newly approved Codex Astartes, the Ultramarines made a series of rapid strikes and defeated the greenskins.[6b]

The Ultramarines' Second Company Captain, Cato Sicarius, Master of the Watch, was born to Talassari nobility, and was trained in the arts of war from a young age. His power sword, the Talassarian Tempest Blade, takes its name from his homeworld's frequent storms. Captain Sicarius is also, among his many honorific titles, Grand Duke of Talassar.[1]

In 854999.M41, the Daemon Prince M'kar personally led the onslaught against Talassar. Marneus Calgar brought the 1st Company of the Ultramarines to Talassar, determined to once again slay M'kar. After the great battle, Calgar was nearly defeated by M'kar but was saved by the arrival of the 2nd and 4th Companies of the Ultramarines, led by Captains Cato Sicarius and Uriel Ventris, respectively. Ventris pronounced the mortal name of the Daemon Prince, and gave the Shard of Erebus to Calgar, who used it to stab M'kar in the throat. As a result, M'kar was destroyed once and for all.[3c]

Talassar is now the homeworld of the Void Tridents, a Space Marine Chapter created during the Ultima Founding[5].


Talassar is a planet of stormy seas and islands of rock. It has a single continent named Glaudor, which was the site of a major battle between the Ultramarines and Ork invaders just after the Horus Heresy.[3a][6b]

Notable Places

  • Castra Tanagra - an ancient fortress located in a valley on Glaudor, the site of an ancient battle between the Orks and the Ultramarines. During the battle, an enormous hole was breached in the walls, but Roboute Guilliman refused to have it repaired, decreeing that the fortress would stand in its battered condition as a monument to those who died during the battle. All Neophyte Ultramarines are required to make a pilgrimage to the fortress after their induction into the Ultramarines.[3b]


  • The name Talassar possibly derives from Thalassa, which was the Greek word for "sea" along with being the name of the personification of the sea in Greek mythology.

See also