There's a forum where you can get your warper
http://eathena.ws/board
You need to register there and get a warper script
It depends what kind of warper you want
There's a basic one inside the eathena file
If you want a custom one, get it from the forum and put it inside npc/custom folder
You need to open a script_custom.conf inside the npc folder
And put this line
npc: npc/custom/yourwarper.txt
Then, you can either restart your server or just add them through in game commands
@loadnpc npc/custom/yourwarper.txt
There's already a basic warper script inside the npc/custom folder
But not that advanced
Revision: May 25, 2012.