Parna's watch list:
%damage% %actor% -10 (to restore health)
Also: note the actor variable to determine hitpoints and the use of variables and eval to work out how many hitpoints need to be taken away to achieve the objective of 1hp. Pay attention to the wait comment.
However: Three things dealing with this echo that I would change if this were my trigger rather than an example:
%echo% The Gods feel sorry for %actor.name% and restore him to full health.