Dark Air

Dark Air (다크에어) is manhwa written and illustrated by Park Min-seo. The series is completed with 12 volumes.

Plot
Magic used to fill up the world. All of a sudden it disappeared. Why? Without magic, once powerful mages are now looked down upon by warriors. Only two individuals in the world are able to perform magic after its disappearance, a mighty wizard and a little boy... Follow Melrose and his companions in their adventures as they are trying to solve this mystery!