Natsu said there was a 'trick' to eating the God Slayer magic, which is pretty much based off the same concept as the Dragon Slayer magic. It's pretty much the same as bypassing the protection on a CD/DVD. Laxus lifted the 'protection' off of his magic, allowing Natsu to copy it in a more permament fashion, while Gajeel just straight ripped it off of Rouge/Raios. Seems that to be eaten, it must 1) have their base element within it or 2) be of a similiar magic type.
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