To avoid dealing with various constants like REGION_ENTER_AND_STOP_TRIGGER or TOME_OF_DESTRUCTION, it's better to replace them with numbers (all numbers are listed in the document IDs for scripts). This makes the code more compact and helps avoid several errors that are almost unnoticeable during debugging.

For example, the codes
Trigger(REGION_ENTER_AND_STOP_TRIGGER, "Gnom", "gnom")
and
Trigger(6, "Gnom", "gnom")
work the same, but the second entry is much easier to use.

function alive()
	while IsHeroAlive("Hero9") do
		sleep(10)
	end
	Loose()
-- or --
  Loose(1)  
end

function alive(heroname)
     if heroname=="Hero9" then
          Loose()
     end
end
Trigger(2, 1, "alive")

I need a script so that the mission fails after a hero dies. Thanks in advance.