User blog comment:FairyRaven/Fairy Tail Chapter 470: Hybrid Theory, Review and Commentary/@comment-9595671-20160125130936

God Serena's 8 dragon slayer elements outright shocks me because I recall that if Laxus' lacrima was ever removed, it would kill him. So I always figured a human's body could only handle a single lacrima of this type.

So for him to have 8? It makes them sound like they're almost impossible to find, like they're the crystallized remains of some dragons' magic. I do wonder what the other four elements he has though and if any of them are new ones.