I've set some timers into my game, but it seems that the script only runs once, and not every time the interval reaches 0.

define timer <food>
	interval <20>
	action {
		msg <|bYou begin to feel hungry.|xb>
		timeron <food_two>
		timeroff <food>
	}
	enabled
end define

define timer <thirst>
	interval <20>
	action {
		msg <|bYou begin to look parched.|xb>
		timeron <thirst_two>
		timeroff <thirst>
	}
	enabled
end define

define timer <food_two>
	interval <10>
	action {
		set numeric <hp; -5>
		msg <|bYou feel hungry.|xb>
	}
	disabled
end define

define timer <thirst_two>
	interval <10>
	action {
		set numeric <hp; -5>
		msg <|bYou feel thirsty.|xb>
	}
	disabled
end define

The timers work together, and once food has been eaten:

define room <Items>

	define object <water>
		alias <Water>
		take
		use {
			msg <|bYou drink the water.|xb>
			timeroff <thirst_two>
			timeron <thirst>
		}
	end define

	define object <Apple>
		take
		use {
			msg <|bYou bite into the apple.|xb>
			timeroff <food_two>
			timeron <food>
		}
	end define

end define

That sends the main food/thirst timer back off again. I need it to take off 5 each time the timer hits 0 on food_two/thirst_two.

Once the HP reaches the 0 or less, the player will die.

FIXED

Instead of trying to minus the value each time, i simply used to decrement tag instead, like so:

		dec <hp; 5>

Yes, the problem was this syntax is incorrect:

set numeric <hp; -5>

should be

set numeric <hp; %hp%-5>

ahh yes now i remember! lol, thanks alex