Need help with this scripting.

[EXAWOLT]

if you want the area to work several times, just change the true to false.
instead of creating an enemy at a entity, i suggest to set out one in the editor and make him inactive, and when colliding with the area, the monster will be activated, and if you die, the monsters will always dissappear but when you collides with the area it will respawn.
SetEntityActive("Monster", true);