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This line seems to be a homage from the Dawn of War 2 intro, in which a Blood Ravens Captain says the same line (Also voiced by Brian Dobson !).
One of the missions has a squad of assault marines facing against Orks, with the Blood Angels Captain Dracomedes (Voiced by Brian Dobson) shouting "Strike from the skies Brothers !". The game is based on an actual in-universe game "Regicide", which is the Imperium's equivalent of chess and mentioned in various 40K media, such as the Ciaphas Cain novels. And if to emphasize the fact, the teaser trailer had a torn battlefield littered with broken chess pieces whilst Space Marines fire their Bolters at unknown targets (One of them even smashes a Knight piece underfoot). Darker and Edgier: This is the 40K version of chess, it is to be expected. Cliffhanger: The game ends with the Warboss killed and his army defeated, but Baldessar explains that the Eldar are at large and that their fight is far from over. Curb-Stomp Battle: What happens between pieces if one is taken out the normal chess way of another moving into place-a fight happens between them, and the character on the receiving end, at most, manages to knock the taking piece's weapon away for a second before getting killed.
Chess Motifs: Space Marine and Ork units have chess motifs. This game provides examples of the following:
Warhammer 40,000 Regicide is a Chess Strategy game developed by Hammerfall based on Games Workshop's tabletop game Warhammer 40,000.