MONSTHP is a variable representing the hp of an enemy. It is set immediately before a fight.
PLYRHP is a variable representing the hp of the player.
MONSTMAXHP is a variable representing the max hp of a monster. It is set immediately before a fight.
PLYRMAXHP is a variable representing the max hp of the character.
MONSTDAM is a variable representing the damage inflicted by an enemy.
PLYRDAM is a variable representing the damage inflicted by the player. It changes depending on the type of attack.