The predator units are all combat-oriented, and they have a number of special abilities like cloaking and self-healing that use up slowly regenerating energy points. The more honor you have, naturally, the more predators will want to join your clan-they can be called in at any time and simply land on the planet from space. As you kill enemies, you can rip the skulls from their corpses in honor of the hunt. The predators have a straightforward resource model that's effectively based on honor. There are a few support units as well: The medic can heal your troops and cure health anomalies, the synthetic can deploy gun turrets and has a motion detector for picking up offscreen movement, and the commtech is your basic support unit, whose job it is to call for extra troops and repair atmosphere generators. There are a diverse number of marine combat units, including pulse rifle-equipped infantry, flamethrower troopers, and smartgunners that use those huge, hip-mounted machine guns you saw in Aliens. The colonial marines gain credits by killing enemies and repairing atmosphere generators, and these credits can be put toward upgrading troop abilities and calling in new units via dropships that stop at nearby landing beacons. Each race has a distinct method of obtaining new troops. You won't do any building and base construction in Extinction like you've seen in Warcraft or Command & Conquer rather, the game is strictly focused on unit management and combat, which helps to streamline the gameplay.

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