there is a critical bug in Vampires Dawn II, made with the RM2k3.
Neither healing potions or other items which refresh health or mana (in this case blood) or heal status effects decrease their amount if used in inventory.
If you try to use it, there comes a failure sound effect which means the item cant be used. But it fills up health etc. and remains in your inventory.
If the item is used in battle, it works as exepted.
Ive tested it on different computers, with different savegames but it seems to be the case every time.
This literally breaks the whole game