User blog comment:Perchan/Fairy Tail 395- Something Something Dragon Slayers (Tartarus arc, Part 5: Ultimate Pain)/@comment-5914413-20140804063308

Hmm, still don't see how shadow can combine to a dual element with iron...

With that Lightning Flame, i can still see how that would be possible but what do shadows and iron have in common that allows for a dual element mode...

Would be rather interesting to see if gray could get an dual element slayer mode now since he should technically be a devil slayer. At least, i think he can technically be called that since he got devil slayer magic from silver...

The bickering between gajeel and natsu over which one had the best dual mode was funny to watch, maybe gajeel replaced gray as the bickering partner for natsu?