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A Creep Ball is a vital item when looking for Biomass. Craft it by surrounding a slimeball with rotting flesh and spider eyes, with the eyes or flesh occupying all corners and the opposite resting in the spaces between the slimeball and corner items. Once your creepball(s) are made, use it on some soul sand to create a Creep Block. Stick your glaive in the center and plant a germinated biomass seed in the patch. You may then offer some blood to it to speed the growth.