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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.[3a] During the Shadow Crusade, the planet was assaulted by the Word Bearers.
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.
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 when arrived the 2nd and 4th Companies of the Ultramarines, led by Captains Sicarius and Ventris. Uriel 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]
- Castra Tanagra: an ancient fortress 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]
- 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
- 4: The Purge (Novella) Chapter 1