You can check on WebSend, A very very interesting mod for me.
It allow you to make some external script with php... Very usefull for me because I don't know java
And perhaps something like monster apocalypse.
At least 2 fonctions :
- the mob can "see" the player from far away, and try to attack
- the zombie can destroy some block (config file for this).
With this you absolutly need to build walls around your base or you will be soon invaded by monster