Recommendations Novels like Terran guardian and Archeon Eon Art

For those who have not read the two novels mentioned above, Im looking for a novel where:

• The entire world faces a grave threat from outside, be it demons, monsters etc.
• The world has formed a united resistance army/sect/guild , kinda like Pacific Rim
• The MC joins this resistance army and vows to destroy all demons/protect the earth

How this applies in the above-mentioned stories:

Terran Guardian:
Its only 12 chapters in but from what I can tell, the world is fighting against demons and has formed a Demon Suppression Division which is a cultivation sect, MC has a level system which helps in cultivation and he vows to protect the Earth

Archeon Eon Art:
The world is attached by demons and the MC's mother was killed by demons so he vows to kill all demons and joins the top demon fighting sect, Archeon Mountain

 

Lord of the Mysteries in case you haven't read it yet.

 

I've been putting it off for a while because of the hype.
Can you tell me how its related the this thread?

 

• The entire world faces a grave threat from outside, be it demons, monsters etc.

The above fits your criteria.