The Devils

The more Ziran thought about it the more difficult it got for him to determine what Lin Mo was.

The information about the devils was highly restricted and even the major sects of the Immortal Realm only knew about the two basic Houtian and Xiantian devils that were more 'common'. 

The devils that were of other types were considered to be a lot rare and were also a level of dangerous where even knowing about them was risky.

This was why their information was restricted until a devil of that type appeared.

There was another big reason that the information about the devils was restricted. This was because the devils not only inspired terror and fear, they also brought temptations with them.

If there was one thing the devils liked more than killing and terrifying people, it was to corrupt them.

They would tempt cultivators with promises of power.