User blog comment:St0mX/ Natsu & Dragon slayers aging theory discussion v2/@comment-26892475-20150817132715

"How come Natsu is the only dragon slayers (we've seen so far) being able to "absord" something other than fire and remember the technique to be able to use it later like his Dragon Lighting Roar." Let me correct you. Gajeel can also absorb other "elements" aside from iron. That was shown during his fight with Rogue in S2 Episode 12-13. And, in a manga chapter, I think Gajeel absorbed Carbon and powered up a lot. Hence, I have a hunch that all Dragon Slayers can be able to absorb other elements if they really will it or with the use of their "nakama magic" or both.