Warhammer 40,000: Dawn of War II

Warhammer 40,000: Dawn of War 2 is a tactical RPG in the science-fictional setting. The sequel to Warhammer 40,000: Dawn of War, the game follows its tendency to simplify strategy aspect and focus on battles. So, base building is removed; instead, you can explore locations and kill various monsters. 
The game's story places you in the middle of the war on the desert planet Calderis. While helping another group, your Space Marines squad is attacked by Orks. This battle starts a whole string of missions, which the campaign mode consists of. The plot had several endings; unlike in previous games, here you need to pick units up before the fight and can't change them later. 
Dawn of War 2 extends the series’ role-play features. You can choose from four races and form armies of six different squads. Every race and squad has its own characteristic. The game also places a heavier focus on weapons and cover with improved physics, additionally making the experience more realistic in a way fights between huge mechs can be.