For 10 points, name this son of Siegmund and Sieglinde, who dies at the end of Gotterdammerung and is the title character of the third opera of Wagner's Ring cycle.
Among this character's pieces are a duet, where he wonders what his mother looked like while a bird warns him about his adopted father's plans, and the Forging Song. He encounters the Gibichings after taking a journey across a river, where Gutrune's potion allows Gunther and Hagen to trick his wife away from him. However, that pair never acquires a certain powerful object from him. For 10 points, name this son of Siegmund and Sieglinde, who dies at the end of Gotterdammerung and is the title character of the third opera of Wagner's Ring cycle.
Among this character's pieces are a duet, where he wonders what his mother looked like while a bird warns him about his adopted father's plans, and the Forging Song.
{Siegfried}