Quest::Spawn Question

[Nall]

Another Simple one if you would,

I understand the existance of the "On Death Event" and the follow Quest::Spawn.

However..

How do you specify that the location of the spawning of the mob is the current location / the location that the mob died at.

Example: Druid Epic - When you kill the Tainted XYZ... On its corpse the "Corrupted XYZ" Spawns.

as we know the location that the mob spawned is not neccesarily where we kill it.

quest::spawn(npc_type,grid,guildwarset,x,y,z) - Spawn "npc_type" on "grid" with "guildwarset" (use 0) at "x","y","z".
 quest::spawn2(npc_type,grid,guildwarset,x,y,z,heading) - Spawn "npc_type" on "grid" with "guildwarset" (use 0) at "x","y","z" facing "heading".
 quest::unique_spawn(npc_type,grid,guildwarset,x,y,z,heading=0) - just like spawn() except will not spawn it if one of that npc_type is allready in zone.