Enthr

It's not implemented by default, so there is not an existing command for that, but, what might do the trick is to spawn an invisible monster in the coordinates saving the GID, and then  do specialeffect 14,AREA,.@gid; then delete the monster.
 

just add the line after the OnPCDieEvent:
if (countitem(501) >= 1) end; where, 501 is the id of the item
 

*mapwarp "<from map>","<to map>",<x>,<y>{,<type>,<ID>};
 
This command will collect all characters located on the From map and warp them 
wholesale to the same point on the To map, or randomly distribute them there if 
the coordinates are zero. "Random" is understood as a special To map name and 
will mean randomly shuffling everyone on the same map.
 
Optionally, a type and ID can be specified. Available types are:
 
 0 - Everyone
 1 - Guild
 2 - Party
 
Example:
 
// Will warp all members of guild with ID 63 on map prontera to map alberta.
mapwarp "prontera","alberta",150,150,1,63;

You can change it by an hex editor, i recommend you XVL32, you open the client exe with it and search the current text of the title in the right part of the program, (of course you can use the search function) and then when you find it you simply write over it, if the title is shorter than the current one ("2010-07-30...") you simply add spaces.

and save it

Yes, its complety possible, in the name of the npc you just put "#npcuniquename" and that its all.

And obviusly you change the npcuniquename for the name that you want, but it cant repeat in another npc.

If you dont want the monsters to load on a map, just edit the respawning, you can found them in npc/mobs/towns.txt or npc/mobs/..., npc/pre-re/mobs/...  etc
if you do a script like the one you put your server will be slowler and might have a very annoying lag (I strongly dont recommend a script that run forever each 0,1 milisecond to just kill monsters on a map)...

If someone wants the code its here: https://rathena.org/board/topic/104441-mvp-arena-with-time-enthr/?view=findpost&p=295812