The single-player campaign has players take on the role of Space Marines, Orks or Eldar. In the demo being shown at E3, players step into the boots of Space Marines.
We saw scouts that can sneak up close to enemy encampments and call in drop squads and elite weapons attacks; snipers with long-range weapons; jump pack-wearing assault marines armed with chainswords and pistols; devastator squads that use bolters and lasers; and dreadnought walkers.
He’s a badass who feels guilty about ordering the destruction of his home planet. He’s also responsible for the most notable battles in his chapter of Space Marines.