The Regrets of the Dead

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As Kireina went to sleep, she quickly managed to sense the strange Realm within her own Soul.

In that place, she glanced at their inhabitants, who were countless of souls without any purpose, most of the beings she had eaten their souls were here.

Kireina had thought that eaten souls would disappear and just become Soul Energy for her soul, but that isn't the case.

Even if eaten, assimilated or destroyed, much like matter, souls cannot be destroyed, they will only change their compositions. And thanks to Kireina's high Soul Ranking, Soul Stats, her unique and strange Soul Mutation, Titles and Skills, a void, a strange space had appeared inside of her own Soul, were the souls that she had eaten were stored…

Most of their Energy was already assimilated by her soul, so these drifting souls were more like part of her soul and were concentrated in this place as their minds haven't dissipated and absorbed by the hive mind of her Soul.