The instant she saw the Blood Emperor's figure, Angel thought this god had come back to life beneath Trier, where he had fallen a thousand years ago.
It was hardly inconceivable. In her experience, both Death and the Ancient Sun God had made plans for their own resurrection. Some had failed; others had run into serious problems. But with their examples, it would hardly be strange for the Blood Emperor to spring out of some corner.
After a closer look, however, Angel realized that the tall, imposing figure occupying one corner of the spring was only a translucent phantom. It was inferior even to the "stand-in Tudor" Antigonus had summoned.
Of course, his aura was real enough, and his gaze, which instantly ignited the urge to fight, mad thoughts, and violent emotions in those around him, was difficult to resist. But Angel had activated the City of Calamity mark within her before entering the cavern. The power of this Sefirah dispersed the surrounding aura that rapidly drove living beings toward death and eternal sleep. It also blocked the influence of the figure, whose vicious, savage aura was no weaker than the Blood Emperor's.
Without a doubt, without a Sefirah's protection, the Blood Emperor's phantom inside the Samaritan Women's Spring alone would have been enough to make a Saint lose control, just as if they had seen a complete Mythical Creature firsthand.
Angels could resist this power, but they would be contaminated by the omnipresent, all-pervasive aura of the River of Eternal Darkness and rapidly approach an inevitable death.
*So this pool is power leaking from the River of Eternal Darkness? But it connects directly to the fourth level of the Underground Catacombs and is guarded by an old man who seemingly can't even detect the arrival of a high-sequence Beyonder.