Easy as pie.
1.Open your pub edit
2.open npc file
3.ctrl + N (makes a new row)
4.Go to the new row (found at bottom)
5.change the name (rat lvl 2)
6.change the GFX to (2)
7.Add what hp etc you want the new npc to have
8.Make sure the EOF is the last npc on the list, you will have to change the ID of the new rat and the eof.
9. Save :)
P.S. Make sure your server is closed before you save. if your server is open, you'll no doubt corrupt your pub files.
Avalanche