On a similar note, what effects will mutations have?
Crucially, mutations are chaotic. If you do not protect your character from toxic substances, radiation and pathogens, you never know if after many days or even weeks of asymptomatic development, one morning you won’t discover a benign mutation. Slight changes are no reason to panic. Usually you can hide them beneath clothes, and get rid of some of them surgically. Worse if you ignore that first warning, because you risk not only new mutations, but also progression of the already existing ones. Only some mutations have any practical benefits, most will only ruin your health or make you a social outcast. However, if the advantages do appear, they can turn the entire gameplay upside down, and paying a character who embraces mutations can be like playing a Wild Mage, werewolf or vampire. Mutations can improve strength, precision, speed, mental capabilities, they can make your character unpredictable for the opponents, resistant to pain, acutely perceptive, etc, and to a degree that no imp