calgar

Calgar is immune to fear and is resolutely courageous under fire; where lesser men would dive for cover when being fired upon, Marneus Calgar takes quick stock of the situation, decides the best course of action, and will only leap into cover when he deems it so. The achievements and deeds of Calgar are recorded in 28 volumes stored within a vault in the Ultramarines' fortress-monastery on Macragge, surpassed in number and magnitude only by the achievements of the Ultramarines' Primarch 

 These achievements include: leading the breaching assault on the Tyranid Hive Ship Behemoth Primus, single-handedly holding the gate against an Ork Horde for a night and a day at the Siege of Zalathrax, defeating an Eldar Avatar of Khainein single-handed combat (thus leading to the rout of Eldar forces at the Battle for Orar's Sepulchre) and recapturing the star fort Indomitable from thedaemonic hordes of M'kar the Reborn, who he then supposedly cast back to the Warp with the help of the Inquisition.

However, M'kar's banishment proved to be beyond Calgar's abilities at that time. Instead, he secretly imprisoned M'kar within the Warp core of the star fort, so that any attempt by theDaemon Prince to escape into the Materium would actually pull him in the opposite direction and make his binding harder to break. Calgar then tasked half of the 5th Company of the Ultramarines as the permanent garrison of the fort, and ordered them to forever chart a secret course within the remote unmapped regions of Ultramar. Calgar's failure to banish M'kar came close to spelling disaster for Ultramar, as the daemon was freed by the Iron Warriors Warsmith Honsou and then proceeded to ally with him in a campaign to destroy the Ultramarines and their stellar empire. In the end, Calgar met the Daemon Prince on the battlefield on the Ultramaran world of Talassar, and was finally able to "annihilate" him using a strange blade known as the Shard of Erebus. In the aftermath, a chastened Calgar is said to have become a person of greater humility, however even after the disappointment at their leader's previous misrepresentations regarding M'kar, the officers and ruling masters of the Ultramarines have undiminished love and respect for the Chapter Master.