Biomass is a sturdy, grotesque organic substance added with the Harken Scythe mod. You must first acquire a biomass seed, made by combining fermented spider eye with nether wart. After that, go to an Altar of Blood with an accessible Blood Crucible nearby. You must then pay some blood to "germinate" the "seed". After that's done, use a Creep Ball on some soul sand to create a Creep Block. Hollow it out by right-clicking with a glaive and plant the germinated seed in the creep block. You may then pour blood on it from an essence keeper or essence vessel to speed up the growth process for one stage, after which you will need to renew your tithe.
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