Legends of the Dark Crystal, Volume 2: Trial by Fire

Although initially unprepared for the savagery unleashed upon them by the wicked Skeksis, the village of gentle Gelfings somehow managed to turn back an onslaught of terrifying Garthim. But the victory came with a price, as many of their tribe were captured and taken prisoner. Now Lahr and Neffi, the two who inspired these peaceful creatures to stand up against all odds, are about to go where no Gelfing has ever returned from—the dark and twisted halls of the Crystal Castle!