Flairon
Skeletron Prime
There is this odd "fake chandelier" added between 1.2-1.2.4.1 which isn't really an unobtainable item, but still cannot be found without using external programs (like TEdit). When trying to put a fake chandelier sprite into a world using TEdit, the map viewer seems to show nothing. If you open up the world, a glitched fake chandelier appears, that doesn't emit light, with random parts of the chandelier and invisible blocks that drop nothing when destroyed. If you break one block, the other blocks don't disappear. Like other blocks, it will still prevent sand/silt/etc from falling, even the "invisible" blocks. The sprite is an inverted platinum chandelier, and the chandelier is not needed as the same sprite can be made by invert-painting a platinum chandelier.