Growth system change
There are some big change in Aion 5.0. Starting from lvl 66, you can choose your own path.
You can choose to either improve the 6 basic stats (Power, Health, Agility, Accuracy, Knowledge and Will).
Or you can enhance your favorite skills.
You can also choose new skills
The needed points to improve these three categories are gained when you level up. You can freely change these points distribution.
Also, it seems like there is no max level. You can reach lvl 83 in 5.0 for example.