Well, recently I started a new world up, new char everything was fresh, wanted to see how many hours it would take to clear normal to hard in a speed run like fashion (A little less than a days time by some luck) first wood sword I got Legendary, was like fawk yeah I'm so lucky! But....then everything else I crafted from then on I got Shoddy, weak, etc or no prefix at all for Picks, hammers, you name it, all my swords were junk or just normal versions. Didn't help when I got goblin tinkerer either, got shoddy night edge first craft and spent all my money just getting "Large" on the night edge :I . I was like wtf, got down to hell after killing all the pre-hard bosses with my grossly underpowered weapons, killed the WoF and just started hard mode up, but still had half my inventory empty, decided to dig upwards, making a second hellavator closer to my house and looking for more gold chests, apparently into a hallowed biome. Killed a pixie on the way to the surface, didn't even notice it's drops, got back home and turns out I got a hallowed key mold.
Same world and character but way later, killed Plantera and got pygmy staff and the Axe, later killed the Golem and got picksaw on the first drop along with the Possessed Hatchet. I think that I got a mix of crappy and good RNG <_> First time getting the Axe though so that was nice.