Tactician of Blood

 You’ve conducted exhaustive research into your own biology and the science of altering it and pushing it to its extremes. The scars of your countless self-dissections and experimenting on your own bodily system can be concealed, but they'll never fade, just like your determination to purge the dark beings with their own darkness. You gain the following benefits:

• Increase your Strength, Dexterity or Intelligence by 1, to a maximum of 20.
• You can concoct one extra mutagen and know two more formulas.
• You have resistance to acid damage and immunity to diseases.