Health
From GMWiki, the Gamemaker Wiki.
health is a built-in global variable that works as a normal global variable despite you don't have to write global. in front of it. Some D&D actions use the variable (eg. Draw the health bar). health can be used to store anything but is meant for storing the amount of health that the player has. When health reaches 0, the event Other->No more health is executed if there is any.

