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Three days after Ervas's evolution, Veronica and Ervas received some important information from the undead bugs they had created to spy on Oggoth in the meantime, observing the sealed entity every move below his nose.
It seems that Oggoth was incapable of sensing very tiny undead that lacked any life force, as his body was sealed, he could only use his consciousness to do everything, which lacked a strong sense of sight or smell, he used his soul to scan his surroundings like a sonar, which always detected beings with either large amounts of mana or life force, but tiny bugs with mana in less than two digits and lacking any life force couldn't be detected, no matter how much he wanted.
Oggoth also lacked the power to see dead spirits, he could control souls trapped inside the small dungeon that was created on his sealing shrine, but nothing else.