Mount Keru.
The Mountain Elves had several libraries. They revered books and knowledge. Books are bulky things, though, and no one is certain how much of their collections was saved.
Or perhaps, hidden away.
But the Elves here do know of libraries. Mount Keru did not have one, as it was on the very edge of the kingdom. The preferential locations for libraries was central, so that more Elves could travel there.
A place called Mount Merinine has the nearest one, and it is that one that matches Lipika's description.
But it is west of here, and it would take about two weeks to get there... or maybe more, if there is trouble in the way.
A second, longer expedition could reach it, but it is beyond the scope of this one.
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Tildi describes the temple area. The good news: it was built using a lot of clear building materials: glass, and magically created substances. That means there isn't much area in and around the building where dangerous things can hide. Goblins hesitate to go there. Apparently, Goblins, being native to craggy, subterranean places, are naturally somewhat agoraphobic. They especially avoid it in the bright light of day, and the mountain top location gets a lot of light.
The bad news, there are some other dangers. The normal regional pests that the Elves used to keep in check are no longer.. in check. There are Griffons of several sorts, including small and cute ones and large and very dangerous ones. There are beetles with silvery mirror like shells. Those were brought here and unleashed by the enemies of Elves, because those mirror shells deflect many kinds of magic, including light based magic.
And if that wasn't enough... the Goblins had allies, and these allies include the jungle Slug Folk. The Slug Folk are far too soft and slow to match Elves in a battle, but they had magic of their own, including necromantic magic, and animated some skeletons of fallen Goblins. The Goblins did not like this, but accepted it as they needed the help from the Slugs.
There are a few of those skeletons still up there. The presence of Elves will cause them to rise. The skeletons are totally unable to hurt the "Light Elves" but neither can the Light Elves do anything to them, although, the skeletons do react to their presence.
All this, the party learns while resting, recuperating, eating, and preparing for the next phase.