- "Only once every hundred years can a firebender experience this kind of power."
- ― Iroh (Avatar: the Last Airbender)
- Astronomical Event Affinity/Empowerment
- Cosmic Event Affinity
- Space Event Empowerment
User becomes stronger, faster, more durable, etc. when they come into contact with cosmic events (including eclipses, comets, meteor showers, equinoxes, solstices, planetary alignments, etc.), possibly unlocking abilities related to the affinity and enhancing the existing powers. Some users may be able to draw sustenance from solar events or even slow or stop aging.
- Decelerated Aging/Semi-Immortality
- Enhanced Condition or Supernatural Condition
- Self-Power Augmentation
- Cosmic Manipulation
- Eclipse Manipulation
- Lunar Empowerment
- Lunar Manipulation
- Space Rock Manipulation
- Solar Manipulation
- Solar Empowerment
- Stellar Empowerment
- Stellar Manipulation
- Cosmic Events may take years and may only happen once during a long time.
- May need to be in a specific location to utilize the event's power.
- Firebenders (Avatar: The Last Airbender); via Sozin's Comet
- Waterbenders (Avatar: The Last Airbender); via the Full Moon
- Vaatu (Legend of Korra); via Harmonic Convergence