I think Ultimecia's power is the power to control time and space.
In physics space and time are closely connected,they call it Spacetime.
She can manipulate spacetime, but there must be a limit or certain conditions in order to use her power to full extent.
Ellone must be the key to unlock her "true power".
This is the power she used in the story :
- Teleportation.
- Passing through matter (door and floor).
- Possessing someone.
Using Edea's Ice Magic.
- Uses time-based spells, such as Haste, Slow or Stop.
- Giving Life to objects (Trauma,Krysta).
If she can do that why she's afraid of death.
- Change a GF into a monster (Tiamat).
- Good at technology (unlocking Adel's Seal from space station and Adel's Tomb).
- Controling Rinoa at the ceremony.
- Filled with anger and hate. Those emotions must be the source of her power too like love for other people.
- She has the knowledge of the past events.
She knew Adel was in the outer space.
But why would she even bother with SeeD's Secrets?
- And ultimately cast Time Compression Magic.
But even with all that there must be something else that we don't notice.
She demonstrates many abilities outside space and time power.
Do you think she also has the power to brainwash/manipulate people?
she casts a fascination spell to the people on the parade.
What is the "Purpose of Time Compression" anyway other than being used for Ultimecia's desires?
So what do you think is the "True Nature" of Ultimecia's Power?