Hearts
From Graal Bible
Hearts and the Player
A graal predefined object; This variable contains the amount of "those yin-yang things" that a player has. It is accessed with the gscript variable "playerhearts" or to determine another player's hearts, "players[index].hearts."
Hearts and the NPC
The amount of hearts (defaults to 0) that an NPC has. It is accessed by "hearts" by itself, or "npcs[index].hearts" for another NPC's hearts.