They are twins — Sieglinde, bittersweetly sung by the soprano Eva-Maria Westbroek, and Siegmund, the leonine tenor Stuart Skelton — separated in childhood. It is their combustible, transgressive love, sparked over that first sip of water, that plants the seeds for the end of a world built on rules, power and greed. Mr. Skelton and Ms. Westbroek were bright stars in a cast led by the blazing soprano Christine Goerke as Brünnhilde. The conductor Philippe Jordan presided over the orchestra, where he whipped up voluptuously sulfurous playing from the Met players.