User blog comment:IamJakuhoRaikoben/Chapter 451: Fairy Heart, Review./@comment-14.201.211.143-20150907102914/@comment-7418318-20150907192729

Most likely the basement wasn't moved along with the guild. This would be supported by there not being a big hole where the guild used to be, since the basement goes down pretty deep. Remember that the guild hall has a regular cellar and LH's chamber is even below that... and a quite high chamber in it's own right.

Anima didn't suck up Dragon Slayers and Edolas-born beings. Maybe it's peculiar features also made sure that Lumen Histoire wouldn't be sucked up.

There's also the possibility that the crystal was specifically shielded by Hades against tampering.

Another possibility is that there actually was infinite magic in that Lacrima, but the Edolasians just didn't know it. Whenever they talked about how much magic the giant lacrima would give them, they always estimated, which leads me to believe they didn't have any way to measure the magical potential of this giant lacrima. If there's too much magic to measure with their instruments it doesn't really matter if it's just slightly out of the measurable amount or infinite... it's simply more than they can measure.