User blog comment:IamJakuhoRaikoben/Chapter 382: Alegria, Review./@comment-24277053-20140428202858/@comment-3424593-20140429001747

What makes you say Gildarts is the only one that can access Lumen Histoire? He and Makarov are currently the only ones that know where it is, but that doesn't mean others can access it, for example, someone who might be Fairy Tail's last hope and gets a visit from Mavis who tells her where Lumen Histoire is :3.

Also, I'm already sure that no other guilds will interfere in this arc and I highly doubt Crime Sorciere and Oracion Seis will appear again.

@Nick, the way I saw it was that Alegria is one of Mard's curse that allows him to manipulate the earth and Pluto Grim is one of his spells, a spell which alllowed Mard to give life to the island. That's also why things came out of the stone wall and wrapped around Kyouka, because he was manipulating it.