The latest Fallout 4 DLC titled Nuka World introduces new legendary weapons. Splattercannon, Acid Soaker, Nuka-Nuke Launcher – Nuka World DLC This guide will show you the best unique and rare weapons in Fallout 4, where to find them and what they do. You can get them by killing unique enemies (and looting their bodies), or by finishing quests. They grant the player special bonuses, like making the target stagger more often, or irradiating/poisoning them. Unique / Rare weapons are the strongest, most useful, and generally the best weapons in Fallout 4.