Some explanation of the various, possibly unknown terms used in this fanfic.

Imperial Guard: The billions of brave men and women who fight

for the glory of the Imperium. Basic training and equipment. Squads consist of 9 Guardsmen plus a Sergeant.

Kasrkin Commandos: Highly trained and disciplined Imperials, very well equipped. Squad consists of 9 Kasrkin's plus a Sergeant.

Vindicare Assassin: Given the best training the Imperium of Man can muster, and the best and lightest gear possible. These assassins are some of the most dangerous in the galaxy. Highly disciplined and brave, and extremely intelligent, only the best of the best have the opportunity of becoming a Vindicare Assassin, as most are raised to be one from birth.

The God Emperor: Creator of the Space Marines, responsible for the creation of the Imperium of Man and it's organisation. The God Emperor is over 10 000 years old, not dead, nor alive. At his time, a living god capable of extreme feats of strength. The living God of the Imperium, and the Imperial religion. Currently on his throne on life support.

Chaos Marine: Space Marines gone evil, they only seek to destroy and spread chaos. Strong genetically enhanced super humans. Wears heavy but strong Power Armor. Much taller and wider than the average human. Very strong. Insane.

Khorne Berzerker: Same as Chaos Marine, except wields an axe or power sword/chainsword instead, and more brutal. They worship the blood god Khorne, and often sacrifice to it. More insane.

Heavy Weapons Team: Much like the normal Imperial Guardsmen, just with heavy weapons. Consists of two Imperial Guards with ammo and heavy weapons. Can provide extremely heavy covering fire.

Defiler: Demonically possessed killing machine. It's two giant claws are extremely strong and can crush most things without any issue. Mechanical roars and screams erupt from it, as it is possessed by a demon from the Warp, screaming in rage. Quite fast considering how clunky it is. It's very large. Artillery.

Thunderhawk: Fast and heavily armed bomber/transport/assult aircraft. Widely used by Space Marines and Chaos.

The Warp: A horrifying alternate universe. Psychic streams allow travel. If using Gellar Fields (which protect them from the raw psychic power of the Warp) it can be travelled safely. Very fast travel, faster than light travel. Daemons come from the Warp.