Hello everyone 
I f I set a thrall or a pet on the option “Guard the area”, will be able to detect players or hostile Ai enemies that they are approach in close proximity from the base ?
That depends.
Your thrall will not engage any enemies unless there’s at least one player close enough to it. The server does not run the AI logic unless there are players nearby. For more information, you can read the wiki page about AI LOD.
As for attacking other players, that depends on the game mode and thrall’s state:
- If PVP is not currently active (e.g. on a PVE server, or on a PVE-C server outside PVP hours), then your thrall will not engage any player.
- If PVP is currently active (e.g. on a PVP server, or on a PVE-C server during PVP hours), and your thrall is following you, then they will engage any player not from your clan that comes within their guard radius.
- If building damage is currently active (e.g. on a PVP server during raid hours), your thrall will engage any player not from your clan that comes within their guard radius.
I hope that helps.
A better method is to put someone in your base as scouting. When anyone gets near the thrall they will move back to their spot and so the event log will show you when someone got near your base as it will be an earlier time than when you came by.
So at pve If I set two archers in the front and back of my base will the event long will tell me who visited me the next time I log in ?
No.
Even if I have them on Scout mode ?
Not who. Just someone because the returning home function does go into that detail. You would have to cross reference it with who was playing then (if your knew).