As the "preliminary evening" within the cycle, "Das Rheingold" gives the background to the events that drive the main dramas of the cycle. It recounts Alberich's theft of the Rhine gold after his renunciation of love; his fashioning of the all-powerful ring from the gold and his enslavement of the Nibelungs; Wotan's seizure of the gold and the ring, to pay his debt to the giants who have built his fortress Valhalla; Alberich's curse on the ring and its possessors; Erda's warning to Wotan to forsake the ring; the early manifestation of the curse's power after Wotan yields the ring to the giants; and the gods' uneasy entry into Valhalla, under the shadow of their impending doom.