Hello raggya2.
Check this out..
rAthena Guide for Permanent Monster Spawn
ok lets have an Example..
Create a text file file in npc/mobs/ name it brasilis.txt
Ex. (this is an Example only to create a permanent spawn follow this guide )
this is the content of our brasilis.txt
Brasilis,0,0,0,0 monster Bigfoot 1060,2,360000,180000,1
then in scripts_monsters.conf add this line to the bottom.
npc: npc/mobs/brasilis.txt
this will read the content of npc/mobs/brasilis.txt
and your done!