Here are some examples:
* Biotic: Relating to or caused by living organisms.
* Aromatic: Having a strong, pleasant smell.
* Psychotic: Relating to or characterized by psychosis (a mental disorder).
* Phototrophic: Relating to or characterized by the use of light as a source of energy.
Essentially, "-otic" adds a sense of quality or characteristic to the word it's attached to.