User blog comment:Atland/Terraria Suggestions ~ Fragment parts/@comment-4505682-20111008024728

If you're going to have it be a 50% chance of it not showing up at all then you need to make it so that it's in a specified place every time (IE a unique floating island, a unique hell tower, etc) so that if you find the place where it should be and the chest located there doesn't contain it then you know to move on to the next world rather then searching endlessly. Also, the stat boosts aren't great enough to sacrifice that many hours of gameplay, now if you added immunity to lava and more additional damage on weapons(or defense on an ancient armor set) then it may be plausible to implement.