Imperium of Man
From Exterminatus Manual
Exterminatus features one the chapters from the first founding of space marines, the Ultramarines chapter. The Ultramarines use blue as their chapter colour and bear a long standing grudge against the Tyranids since they nearly wiped out the Ultramarine homeworld. Each chapter has ten companies, each with it's own company colour. Exterminatus features marines from the Ultramairnes 2nd company, they can be recognised by their blue armor and golden yellow trim.
Bottom Left of the HUD shows a counter indicating the time to the next spawn wave and a sloped bar showing how much health you have remaining. Bottom right shows a sloped bar of how much ammunition you have in your current weapon and a counter of how much reserve ammunition you have for that weapon. The small symbol above the ammo counter shows what mode your weapon is in (see Boltgun) and if your jump pack is charged (see Assult Marine). The crosshair will highlight when you are targetting an enemy.
The majority of a company's marines are formed into flexible 'Tactical' squads. The majority of marines in a Tactical squad are equipped to deal with all sort of situations, these make up the Tactical class in Exterminatus and are the basic fighting class of the Imperial team.
Space marine assault squads are intended to rapidly cross difficult terrain and sieze strategic positions, possibly even behind enemey lines. Assault marines are equipped with powerfull "Jump Packs" that use a combination of anti-gravity and jet thrusters to perform leaps hundreds of meters or several stories high.
Experienced 'Veteran' marines are often put in charge of combat squads of tactical marines. Over the decades of service they give to the chapter they earn the right to use more exotic equipment, often favouring more close combat weaponry and a leadership role. These 'Veterans' make up the second Imperial class, adding more equipment and speed to the Tactical class.
Most tactical squads contain one marine who is trained in the use of support weapons. These are often rare, difficult to use or otherwise specialised in their function. The 'Specialist' class in Exterminatus is a Tactical marine who has traded in his Boltgun for a Meltagun, Flamer or Plasmagun.
Apothecaries are marines specialy trained to tend to battle wounds and the biological enhancements of his chapter. In Exterminatus they fulfill a support role, healing injured marines.
A heavy weapons operative makes up the final component of most tactical squads. Using the large, heavy, awesomely powerful weapons to support his squad the 'Heavy' class is the pinnacle of the imperial classes, able to blast his way though hordes of foes with relative ease. All that fire power comes at a price, the mass of his weapon reduces heavy weapons marines to a plodding pace.
An elite amongst the space marines, honoured with the use of the the rare and powerful Tactical Dreadnought (Terminator) armor. Terminator armor makes these warriors extremely hard to kill, combined with their double barrelled "storm" bolters they are a deadly opponent to be feared by all Xenos.
Siege Dreadnaughts (Dreads) are monsterous, heavily armoured, cybernetic war machines, containing the bodily remains of a mortally wounded spacemarine hero. Dreads can survive a terrific amount of damage, provinging walking cover for their fellow marines, wile laying down walls of smoke and fire.
Exterminatus VS 40K
The imperial team is drawn from members of Ultramarine tactical squads. However squad composition, that is to say the mix of weapons and roles within a squad that are limited on the table top are much ignored for our purposes to enable rewarding players individually with a superior class. This can result in a less than tactical mix (Four heavy bolters at once for instance).
The unit coherency rule is also ignored, no player would put up with being attached to his team mates with invisible bungie cord in a firefight. However players that go off alone "rambo" style are more likely to get ambushed by a Lictor
For players without microphones communication can sometimes be a problem. As an aid to these players EX features a set of pre recorded vox (voice) commands to allow players to communicate a limited set of tactical remarks. The Vox Command menu is bound to the F2 key by default. Each command on the menu is bound to it's repaective number key.
Space marines deploy with a limited amount of ammunition, which they sometime live long enough to deplete. Replacement ammunition can be purchased from an Ammo Shrine in exchange for reward points. Since terminators carry no spare bolts they most often need to use an Ammo Shrine. To purchase ammo, walk up to the shrine facing it and press your USE key (your HUD should tell you what this is). As a player you must judge if you can do more good with the life you have left or wait to spend your rewards on a better class when you respawn.