Take your Dramen Staff and use it with the air, fire, water, and earth altars in that order to make it into a Lunar Staff. It will still be able to teleport you to the Lost City. Take the Lunar Staff back to the Oneiromancer and she will tell you about the Lunar Clothes.

 

 

 

I used the dramen staff on the air altar, But nothing happened.

 

May you tell me why ?

Check your quest journal. It tells you in what order you have to take them to altar.

How to change to lunar magic ? and otherwhise ?

This question just answered in the post above yours, although I think you craeted the topic in the first place

 

You need to complete the Lunar Diplomacy quest to get that spell book.

 

 

 

Once you're done you can turn Lunar magic on/off at the Lunar Altar on the island.