There was this magical power over Lorien that was protecting it...and that was because of Galadriel. As
Raynor and others allude to, Galadriel used Nenya to preserve and protect Lorien. And we are told Lorien (and the power within Lorien) could only be overcome if Sauron came himself:
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Three times Lorien had been assailed from Dol Guldur, but besides the valour of the elven people of that land, the power that dwelt there was too great for any to overcome, unless Sauron had come there himself.~Appendix B: Tale of Years, The Great Years.
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