sorry for not replying earlier (im not on here as often as discord and steam) but the demon tooth necklace is the combination of sharktooth necklace, magma stone and demon scythe at a tinkerer's workshop; mechanical charm (apparently not in the version of the time of the screenshots) is the previous upgrade, 150 wire, 20 hallowed bars and 10 souls of fright, might and sight at a mythril/orichalcum anvil; lizhard tooth necklace (now solar charm) is the previous upgrade, 10 life fruit, and eye of the golem and 2 broken hero swords at a lihzard furnace and moon lord's necklace (now moon lord's charm) is the previous upgrade, 10 luminite bars, 10 chlorophyte bars, 10 nebula, vortex, stardust and solar fragments at an ancient manipulator