Because I saw a lot of +5 energy when enchanted items yesterday, with a character I brought over from Prophechies, and I don't even know what killing Shiro means.
I walked from the city you arrive in to Marketplace, and somewhere along the way encountered a crafter or collector who offered Energy +5 while enchanted weapons.
I'm sorry that I can't be more specific; there was a lot to take in on my first visit.