Learning new art
Sam went into the tower's library. He is going to learn a new art. The Spirit enchantment. This is also a minor profession like the Seer tower.
They are dark element users, who use a form of necromancy to attach spirits to the weapons, formation discs, artifacts, Puppets, and so on.
These spirits wouldn't be a good as the naturally formed Spirits of the weapons and they can be destroyed easily if the object which was enchanted was of low rank and the user is of far superior cultivation level.
If the user is powerful, he can even kill the spirit with just a mere thought.
But why do they still use it? It is used for better coordination between the user and the weapon. They will have a contract after the spirit is enchanted and if given enough time, the spirit could grow strong with sufficient nourishment, and along with that, the weapon should be reforged from time to time to adjust will the level of the weapon spirit.