The Zodiac spear. There were 4 chest randomly(well scripted, but you know what I mean) placed throughout the world. If you opened any of them - you couldn't get the item. I've read that many think it was a ploy to sell strategy guides.
That since has changed now. You can't miss out on the spear now.
Oh sweet, so I'm fine to open every chest I see? How exactly do you get the spear? I'm assuming it's like the best Uhlan weapon based on the name alone, lol