Imran Dhral - Coryphaeus (war leader) of the 10th Host. Formerly Captain of the 3rd Company. Emerged as the best leader and strategos during the post-Samson war games.

Update: Doing quite well, Castor is mighty pleased with himself for picking him as Warleader..

Nim Gral - Anointed (terminator) Captain of the 1st Company. A child of Colchisian refugees, but not a Great Crusade veteran. The veterans look to him for guidance.

Update: Killed in melee with Tiger's Chapter Master.

Ta'zaak: Captain of the 2nd Company. The most heavily mutated marine in the 10th. Fused with his power armour. Lives only for the Word and War.

Update: Wiped out along with his entire Company during the opening hours of the fight for the Tiger's Battle Barge.

Drosos - Captain of the 3rd Company. Veteran Sergeant under Imran Dhral. Has the misfortune of being named similarly to the Patron of the Calixis Sector, Saint Drusus.

Update: Has performed very well.

Lorgos Tak - Captain of the 4th Company. Promoted by Obel Gar. Highly competent, but bears watching.

Update: Has performed well. Castor believes that he knows the 'identity' of the Gal Vorbak commander. Still bears watching.

Katarn Colchis - Captain of the 5th Company. A Colchisian marine. Devoid of creativity or initiative, but 10.000 years of lead men into battle have made company command a reflex for him. He is also very good at teaching new recruits and seasoning young marines (without getting them killed). Assigned to one of Castor's own companies because he is unflinchingly loyal to whomever is the current Apostle.

Update: Has stoically slaughtered his way through every battle. Still completely unimaginative, but possessing an uncanny ability to kill while remaining alive. More importantly this ability seems to rub off - to an extent - on his subordinates.

Baltus - Captain of the 6th Company. Served as a Captain under Obel Gar, but was an officer long before that.

Update: Lost, along with much of his command during the boarding of the enemy flagship at Karrik.

Tam Caron - Captain of the 7th (Assault) Company. Former Coryphaeus; the merciful Castor let him live on in a role more suited to his nature.

Update: Proved his worth many times over aboard the Tiger's battle barge; with Nim Gral dead at the hands of enemy the assault might have ground to halt were it not for his extreme aggressiveness and willingness to sacrifice the lives of the other marines.

Juron Gaik - Captain of the 8th Company. Recently promoted from the ranks of the veteran sergeants by Castor.

Update: Has performed well. His company has survived better than most thus far.

Tholkis - Captain of the 9th Company. A native of Sicarus. One of Castor's own veterans.

Update: One of the few marines to fall during the ground-based part of the Icefang Assault. Shot dead by a head-shpt from scout-sniper using a lascannon. He was swiftly avenged by one of the Reaver titans.

Jovus Err - Captain of the 10th Company. The only Chaplain to retain command after Castor's reorganization.

Update: Has performed very well. Presumably invoked a daemonic pact to be carried to safety when Castor's assault on the enemy flagship turned sour; maybe that counts as abandoning your men, or maybe it counts as having preserved an important asset?

Anaximander - Captain of the 12th Company. Formerly of the Adeptus Astartes. Turned renegade and worked as a mercenary and pirate for millennia before finding true purpose in the Word. One of the deadliest warriors in the 10th - and a fine leader.

Update: Has performed very well indeed.

Sis Tak - Dreadnaught veteran of the Great Crusade. He spends most of his days slumbering and meditating. He's fairly sane and a source of much wisdom. He also has the ear of many of the older veterans.

Update: Sis Tak is one of two surviving dreadnoughts; the other three having been killed. The good news is that several more dreadnoughts will soon be joining the ranks - the 10th has no shortage of hopelessly crippled marines to entomb!