Building upon the core of the 40K world rather than acting as a simple ... headed eagle as a simple background design, the Imperial Aquila has a much deeper meaning than most players realize.

The Emperor granted the legion, now named the Emperor’s Children, the right to wear his insignia of the two-headed eagle known as the aquila ... and iconic designs in 40K; they play along ...

The first Warhammer 40k Darktide DLC is the Adeptus Arbites, adding a companion class to the co-op FPS game alongside a progression rework.