World seeds massively change how you play Terraria, messing with the core rule set, the world generation, the colours, balance and pretty much everything. Let’s take a look at the mysterious Vampire seed, the impact it has and just how to unlock it. When you unlock the Vampirism seed, it will be added to the Secret Seeds, the blacked-out tree with the little question mark. Related 13 Best Terraria Seeds To Try From secret easter eggs to genuinely useful seeds, here is a countdown of some of the best seeds in Terraria for your new world. Subscribe for Terraria secrets: unlock hidden seeds Get more secrets—subscribe to the newsletter for focused coverage of Terraria seeds and hidden mechanics, with clear seed unlock guides, practical survival and exploration tips, and curated finds to extend your next playthrough.