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During the [[Shadow CrusadeHorus Heresy]], the planet was assaulted by the [[Word Bearers]] as part of the [[Shadow Crusade]].{{Fn|4}} Thrown into unrest by the Shadow Crusade, Talassar [[Carrion Realms|was subsequently conquered]] by a [[Night Lords]] warband led by [[Mawdrym Llansahai]]. The Night Lords managed to convince parts of the local garrison to defect to their side,{{Fn|7a}} and they plundered the local [[Ultramarines]] [[gene-seed]] stockpiles to create [[Inductii]] to bolster their numbers.{{Fn|7b}} In 010.[[M31]], a [[Blood Angels]] and [[Solar Auxilia]] strike force raided Talassar to recover the remaining gene-seed; this operation succeeded and greatly weakened the Night Lords presence, but the loyalists withdrew.{{Fn|7a}}{{Fn|7c}} For months after the raid, Talassar fell into complete anarchy as various factions (including the surviving Night Lords) fought for control until the planet was later retaken by the Ultramarines.{{Fn|7c}}

LaterAfter the Horus Heresy, 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.{{Fn|6b}}

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]].{{Fn|3a}}{{Fn|6b}}

*[[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.{{Fn|3b}}*[[Velx City]] - major settlement by the Horus Heresy{{Fn|7a}}**[[Castrum Velx]] - an Ultramarines fortress which was captured and used as headquarters of the Night Lords during their rule of the planet{{Fn|7a}}