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Phantoms of Souls. Apparently, and according to the Venerable's words, the Frost Tower is kind of like a Radio Tower of "Emotion Essence". Depending in those that enter the tower, the tower will pick up the Emotion Essence spread out into the world which has an affinity with those in the trial and create Phantoms of Souls of those people precious to them. Even if they're dead or alive, even if it is the same person even, it seems that anything would appear. Perhaps the whole reason I got divine power from absorbing my other self was because it was made out of my own emotion essence which might had been imbued with divine power too.
But she also said that if those people that appear are dead, those that they saw might actually be something similar to their actual souls… Which is scary and interesting at the same time. The power of a Venerable's Creation is truly intriguing.
Check "The Protagnist's Sister Is Actually the Strongest"!