Catalysts are weapons in Dark Souls 3 that allow the Ashen One to unleash powerful spells that can obliterate common enemies and bosses alike. There are all kinds of sorceries, pyromancies, and miracles, all with their lore that adds to one's knowledge of the deep and sinister world one must travel through. Given how immense the build variety in this game is, it's easy to see why some people may want to tinker around with investing points in other skills that make their magic stronger and let them play the game in a unique way.