In Norse mythology, Sigurd is the hero and central character to the Volsunga saga. During the saga, Sigurd fights and kills Fafnir, a man who has been transformed into a dragon, in order to avenge the murder of Fafnir's brother, whom Fafnir killed while under the spelled of a cursed ring.
Ymir
The Valkyries, Odin's shield-maidens.
Paris does not feature in Norse mythology.
Valkyries were the Norse 'choosers of the slain' they scourged battlefields to look for brave souls to bring to Valhalla.
Fenrir is a monstrous wolf in Norse mythology, known as the son of the trickster god Loki. He plays a significant role in the events leading up to Ragnarok, the end of the world in Norse mythology. Fenrir is foretold to break free from his chains and wreak havoc during Ragnarok, ultimately devouring the god Odin before being slain by Odin's son, Vidar.
"I have slain the dragon" is grammatically correct. "Slew" is the simple past tense form of "slay," while "slain" is the past participle form used with the auxiliary verb "have."
Beowulf
This was the dragon that protected the Golden Fleece. There are several versions of the story: in one, it was slain by the hero Jason, in another, it was put to sleep by the witch Medea.
In Norse mythology, the god believed to have created the earth is Odin. He played a central role in the creation of the cosmos, along with his brothers Vili and Ve. Together, they shaped the world from the body of the slain frost giant Ymir.
The giant slain by Odin is known as Ymir. In Norse mythology, Ymir is considered the primordial being from whose body the world was created. Odin and his brothers, Vili and Vé, killed Ymir and used his flesh to form the earth, his blood to create the seas, and his bones to make the mountains. This act set the stage for the creation of humanity and the cosmos in Norse belief.
There are many stories throughout Western mythology that involve an evil dragon being slain. Beowulf describes Fafnir's defeat and the Hobbit series details Smaug's demise, for example.
The word Valkyrie means 'Chooser of the Slain' in Old Norse.