The fifth edition of Warhammer 40,000 was released on July 12, 2008. While there are significant tactical differences between the fourth and fifth editions, the general rule set shares numerous similarities. Codex books designed prior to the fifth edition are still compatible, albeit with some changes to how those armies function. -wiki

Apocalypse is a Warhammer 40,000 expansion, which adds rules for playing very large-scale games for the game. It covers the new rules for games of enormous scale, as well as covering many of the logistics of playing one of these games. -lexicanum

Apocalypse Reload allows you to take your games of Warhamemr 40,000 Apocalypse to a whole new level. Command hundreds of men and squadron after squadron of vehicles in deadly battle formations. -GW

Cities of Death is a Warhammer 40,000 expansion. It adds rules for playing in an urban enviornment for Warhammer 40,000 4th Edition. It deals primarily with combat in cover, combat between different heights of terrain, and objectives that are catered to an urban setting. -lexicanum

This 80-page expansion book contains all of the rules and information you need to play games of Planetstrike; including: full rules for configuring your forces for planetary invasion, a full-colour hobby section on preparing your defences, and a comprehensive background section detailing some of the most infamous planetary assaults. -GW

A codex (often pluralized as codexes, although the correct Latin word is codices), in the Warhammer 40,000 tabletop wargame, is a rules supplement containing information concerning a particular army, environment, or worldwide campaign. – Wiki

The Black Templars are a Second Founding chapter derived from the Imperial Fists. Since that time, the Black Templars have campaigned on a never-ending crusade. -lexicanum

The Blood Angels were one of the original Space Marine Legions. Their Primarch is Sanguinius. They are particularly well known for their bloodthirsty nature in battle. They are also one of the most long-lived Chapters, and have a refined aesthetic sense. -lexicanum

They are from the obscure dimension in the Warhammer 40,000 and Warhammer universe known as The Warp. Servants of the four gods of chaos, they walk and roam all over the warp, from Khorne bloodletters to chaos furies. -lexicanum

Chaos Space Marines or Chaos Marines, are Space Marines who serve the Chaos Gods. They are also referred to as the Traitor Legions, primarily in background material written from the perspective of the Imperium. -lexicanum

Daemonhunters, the members of the Ordo Malleus are the greatest men and women of the age – able to stare into the Abyss and know their foe without succumbing to madness and heresy. The strength of the Inquisitors of the Ordo Malleus is bolstered by their Chamber Militant, the Grey Knights. -lexicanum

The Dark Angels were one of the twenty original Space Marine Legions. Their Primarch is Lion El’Jonson. This loyal legion was later re-organized and divided into several Chapters according to the Codex Astartes. One of them would keep the original name and assets. -lexicanum

The Dark Eldar are kindred to the Eldar, an ancient and advanced race of elf-like humanoids. Their armies usually have the advantages of speed and technology, though they are often lacking in resilience and numbers. The Dark Eldar revel in piracy, enslavement and torture, and are sadistic in the extreme. -lexicanum

The Eldar are a race of elf-like humanoids. Once they dominated the Milky Way galaxy but these days they are a dwindling race. With the Fall of the Eldar they lost their main homeworlds and are currently scattered among the stars. -lexicanum

The Imperial Guard is the primary fighting force of the Imperium, so numerous in size that even the Departmento Munitorum cannot place a figure on the number of Guardsmen under arms at any one time; the daily lists of new recruits and toll of casualties are themselves estimated to run into the millions. -lexicanum

The Necrons are a mysterious race of skeletal warriors that have lain dormant in their stasis-tombs for millions of years. They are ancient beyond reckoning, pre-dating even the Eldar. At long last however, they are beginning to awaken, for the galaxy is ripe for the greatest harvest since the demise of the Old Ones. -lexicanum

Orks are a warlike, green-skinned race, spread throughout the galaxy, seen by their enemies (everyone else) as savage, warlike and crude – but they also are the most successful species in the whole galaxy, outnumbering possibly every other race. -lexicanum

Space Marines (or Adeptus Astartes) are elite soldiers enhanced to superhuman levels through gene therapy, surgical modifications, and hypnotic indoctrination. -wiki

he Space Wolves were one of the twenty Space Marine Legions, being led by their Primarch Leman Russ. After the Horus Heresy and the resultant reforms, the legion was divided into two chapters: the new Space Wolves chapter retained the name of their parent Legion, while the second chapter took on the name of the Wolf Brothers. -lexicanum

The Tau are a young race of technologically oriented beings from the Eastern Fringe. T’au, the Tau home planet, was discovered in 789.M35 by the Adeptus Mechanicus ship Land’s Vision. Adeptus Mechanicus records indicate that at that time the Tau species had mastered the use of simple tools and weapons, as well as fire. Before the planet could be cleansed and colonized by the Imperium however, a violent warp storm erupted around the planet. This continued for 6,000 years, making the Tau’s homeworld utterly inaccesible. -lexicanum

The Tyranids are an extragalactic alien race, whose sole purpose is the consumption of all forms of genetic and biological material in order to evolve and reproduce. Tyranid technology is based entirely on biological engineering. Every function is carried out by living, engineered creatures, each of which collectively forms the Hive Fleet, directed by a single Hive Mind. -lexicanum

The Ordo Hereticus is one of three major orders of the Inquisition. Their specific role is protecting mankind from itself, by combating such internal threats as treason, mutation, heresy and "witches". They are aided militarily by the Adeptus Ministorum’s Sisters of Battle. -lexicanum