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It 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.[Needs Citation]
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.
- Castra Tanagra: an ancient fortress in a valley on Glaudor, the site of the 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.
- 1: Codex: Ultramarines, by Rick Priestley, pg. 14
- 2: Warhammer 40,000 4th Edition Rulebook, pg. 91
- 3: The Chapter's Due (Novel) by Graham McNeill, [Needs Citation]