I believe it *dragonizes* your original magic. So its a dragon lachrima on top of your personal magic.
What im saying is that Laxus is a thunder mage with a dragon Lachrima.
Same for the poison one.
But realy i believe that Zeref (if im correct) will be a original dragonslayer.
Also i believe that original dragonslayers have ablities far beyond the lachrima ones. But that remains to be seen.
i highly, highly doubt that zeref is a dragon slayer. why would zancrow look down on dragon slayers if zeref was one? obviously dragon slayer magic comes from dragons themselves, though why is far beyond my ability to comprehend.
however your theory does seem sound. ones main magic becomes the magic of a dragon when you take in lacchrima. i also see that original dragon slayers are far more pwoerful. lachrima are just imitations. i have a feeling there is something deeper ot dragon slayers than why we see on the surface.
---------- Post added at 09:20 PM ---------- Previous post was at 09:15 PM ----------
I was thinking you know... I think that Zeref is dragon slayer as well.
The black dragon Gildarts talked about, is probably his father.
I think all dragon slayers lost their memories or something, and Zeref is the only one who still has them.
That's why Natsu was like... "Wendy, I know that name from somewhere." and later on he found out that she is DS as well.
that wouldn't make a lick of sense. for one thing, natsu was a kid, everyone saw it, and so was wendy. gajeel childhood has yet to be lookd into. all of them were raised by dragons, who mysteioursly disapeared the same time that lucy's momma passed intothe next world. this black dragon......that is a bit of a mystery. who said that all dragons were involved in that raising situation? there are probably others, but who says black dragon was one? but seref is certainly not a draogn slayer. i did think he might be a new dragon slayer at first, somehow the dark kind, but that was before i knew he was the zeref mentioned with a voldemort worthy shudder so many chapters ago.