Once you reach level 99 you can talk to the “Aura Manager" NPC which is located in Prontera.
To find him write in the game chat /navi prontera 173/176
It will show you its location with arrows on the ground, which you must follow.
This NPC lets you customize your aura in 3 different parts the Base, the Swirl, and the Bright.
HOW TO USE THE NPC
The Aura Manager NPC is totally free, you can choose between 152 Aura Base, 117 Aura Swirl, and 35 Aura Bright.
When we talk to the aura manager NPC, he will show us the 3 aura options to change, all the options will start at 0 since,
0 is the desactivated option.
Use the "Next" and "Previous" options to review the Auras, you can go back and forth as many times as you deem convenient.
The "Jump to..." option will allow you to go to a specific Aura by entering the number you want, so you don't have to check them 1 by 1"
The "Revert to Original" option give you the Aura (or not the Aura) you had before starting.
And Finally once you are decided you can save your chosen Aura with the Save Option, or simply close the window.
Important : It is not an obligation to use the 3 types of auras at the same time, you can use only 1 or 2, it depends on what you like best, enjoy it.