It amazes me how the Space Marines still chant the Emperor's name instead of the Human Empire, even though the Emperor of Mankind has been dead for thousands of years.
He’s not dead. He’s dying, yes, and has been for ten thousand years, but he’s not dead. The Golden Throne, his seat of power, doubles as a kind of psychic life support; anchoring his soul to the physical world even as his body withers and rots away. The unfortunate side effect of this is that, due to the Thrones power requirements, ten thousand human psykers must be sacrificed every single day