Physiology is the study of the biological processes required for life. Alchemists trained in Physiology will find themselves able to utilise this knowledge in two primary ways:
With the first they may manipulate the humours, or vital fluids, and the second aspect being the creation and control of homunculi.
Abilities in Puppetry
| Ability | Description |
| Humourism | Tinker with an enemy's vital fluids. |
| Cultivation | A homunculus will serve you faithfully. |
| Eyes | See through the eyes of your homunculus. |
| Legs | Control your homunculus's legs from a distance. |
| Wrack | Afflict an opponent by assaulting the humours. |
| Arms | Specialised attacks for your homunculus. |
| Evaluate | Discern the vitals of another. |
| Ears | Listen through your homunculus's ears. |
| Diffusion | Manipulation of two humours at once. |
| Mouth | Speak through the mouth of your homunculus. |
| Saturation | Concurrent control over three humours. |
| Hands | Your homunculus possesses dextrous fingers. |
| Effusion | Mastery of all four humours. |
| Torso | Your homunculus will prevent an enemy from escaping. |
| Truewrack | Wrack two humours simultaneously. |
| Throat | Your homunculus's screeching will startle an enemy. |
| Inundate | Attack an already imbalanced humour. |
| Corruption | Capitalise on your homunculus's alien physiology. |
| Transfusion | Eternal life with a brand new body. |
| Reave | Kill another with catastrophic organ failure. |