You can try the summon command just be sure to run it from an npc that isn't attached to the player.
*summon "monster name",<monster id>{,<Time Out>{,"event label"}};
Some other methods...
.mob_id = monster("<map name>",<x>,<y>,"<name to show>",<mob id>,<amount>{,"<event label>",<size>,<ai>});
startnpctimer;
end;
OnTimer<time>:
unitkill .mob_id;
stopnpctimer;
end;
You could do the same thing as above but with killmonster instead.
monster("<map name>",<x>,<y>,"<name to show>",<mob id>,<amount>{,"NPC::OnBlahbanditded",<size>,<ai>});
startnpctimer;
end;
OnTimer<time>:
killmonster "<map name>","NPC::OnBlahbanditded";
stopnpctimer;
end;
OnBlahbanditded:
end;