Thanks a lot for your comment!
The game will show you an indicator as soon as you can do a reincarnation (it's after reaching Prestige Level 8).
If you try the reincarnation before lvl 8 the game will tell you the min. requirements.
You don't have to reincarnate then but I would recommend it. :-)
Have fun playing 'Dark Idle' and please tell me your opinion after the reincarnation.