This was uncomfortably close to the history Gadriel knew, the ancient history, of the Horus heresy, leading to the, not death nope we don't call it death because he's not technically dead, of the Emperor.

"I do not like these revelations." If they were to be trusted. "If he was part of this world, as Vesper said, then his death could be what started the collapse of...everything." Great job, faction leaders.