Board Thread:News and Announcements/@comment-209.65.61.7-20130207100929

As it has been shown by chapter 318, Natsu and Gajeel have both eaten elements outside of their original elements, and gained stronger powers that combine the two elements (Their original+new element eaten). This could be an argument that only First-Generation Dragon Slayers can harness this ability of being able to take on the element of their enemies, as Second Generation and Third Generation Dragon Slayers have not shown this particular ability. 