when I say seed I'm just giving an example, the NPC is always spawn with the npc ID, the NPC ID is like the unique code that is given in its branch, no other NPC can have a similar ID unless just to give it a visual change.
<NPC id = "70110" <-----(With this ID you can make the NPC appear) displayId="32944" <-----(With this ID you can only give the NPC appearance) level="85"<----- (NIVEL NPC) name="Portal" <----- (Name use intro server) usingServerSideName="true"<----- (CUSTOM NAME ON/OFF) title=" Here Title of NPC " usingServerSideTitle="true" <----- (TITLE ON/OFF) type="L2Teleporter" <----- (Type NPC) >