Hello, just making sure,
Are you using the latest (or at least updated) version of rAthena?
If you are referring the "New World" to be Manuk Field / Splendide Field / others, rAthena r17421 (2013-07-18) HAS supported it. (that's my rA version. I know, it's outdated).
If you have a newer one, make sure that you have and your server is reading:
npc/re (or pre-re)/mobs/fields/manuk.txt and splendide.txt
as well as
npc/cities/manuk.txt and splendide.txt
by default, those are being read. (check your map server log window too, to check if any error is being encountered)