User blog comment:Woest/Raven Tail/@comment-4829046-20131119155845/@comment-7418318-20131119182218

I think he would have used it as a bargaining chip to get what he wants from Zeref.

But I doubt it'd be just a scroll. Gildarts was struck speechless when he first laid eyes on it and reacted too fast to have been able to read anything. And Makarov said he reacted the same way when he saw LH the first time, so I think it must be something a lot more impressive, or unexpected than a mere scroll.

Also there were lights coming out the chamber and I doubt it was just a spotlight to be able to read better ^^