I was struggling to make a biomancy-focused wizard for the Cosmos compendium. It was hard to make something special given how restrictive the subclass chassis was and how broad biomancy really i, but I took another attempt. It's possibly stale, but should have enough flavor for a biomancer character.
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The School of Biomancy lurks in the recesses of arcane society, centered around modifications to the human body. As you focus on the dark intersection between abjuration, necromancy and transmutation, you learn to change, enhance, and otherwise affect the physical manifestations of living things. Biomancy is typically seen as dark magic, but commonfolk are willing to overlook it as long as necromancy is around.