When Alusec caused the destruction of the second layer by detonating the diminishing void, no one knew that his clone wasn't destroyed.
Calicrum thought that with the explosion of the diminishing void, Alusec's clone would have been destroyed also but it turned out that this wasn't the case.
After Calicrum left the second layer, Alusec's clone appeared on it.
Alusec clone still had a lot of strength from being the previous guardian of the diminishing void.
Alusec clone also had the same thought process and memories as his original self so he used a technique that turned him from a physical to spiritual form that was in the shape of a bug.
This form made sure that his presence wouldn't be sensed by anyone but it was also irreversible and the things he could do in that form were very limited.
He could stick to a person's body like in this form and the person wouldn't even know that he was there.
