Brinsbourne's Easter Egg:
There is a hidden path right next to the cave in northwest outside of the brinsbourne city (the place where you and rhyn the elf) first arrived. The chest contains really high quality weapons. You must accept the side quest from the Ankanian man and then defeat the 2 monsters inside that cave to access that secret path.
Power Mace & Dragon Armor:
They are the 2 very best goodies in the game. The only way (that I know of) to get them is to "thank" (from multiple choices) arthur during the orcs scene.
Later he'll give the armor to you as a gift.
To get the power mace, you'll have to accept the Prince offer to kill his brother.
Item – Location:
Dragon Armor - Golden Castle prison
Power Mace - Golden Castle conference room