Lu Ran, together with Mr. Husky, kept disappearing and appearing at the teleportation point outside the Secret Realm.
After numerous experiments, Lu Ran confirmed that it would be fine to enter Infinite City with Mr. Husky and the Sword Spirit, as well as entering the Infinite City Secret Realm together.
That is to say, Mr. Husky could enter the Evolutionary Secret Realm, and the Sword Spirit would be able to stay by his side.
This discovery gave Lu Ran a bold idea.
Since Mr. Husky was so powerful when the Sword Spirit possessed him, what would happen if the Sword Spirit also possessed him during his evolution?
Anyway, Mr. Husky would have to carry a sword at that time.
So, it seemed that carrying the Sword Spirit wouldn't make much of a difference.
Moreover, the Necro Divine Sect seemed to have researched letting undead spirits possess during evolution.
Their research, however, was on possessing inanimate objects.