In Norse mythology’s Ragnarok, Freyr fights Surtr without his usual magic sword. Freyr had previously given the sword to his servant Skírnir, and the loss leaves him vulnerable in the final battle.
The sword is exceptionally important because it can fight by itself, making it one of the most remarkable weapons in Norse mythology. Freyr gives it away as part of his courtship of the giantess Gerðr, a decision that later has fatal consequences. At Ragnarok, he faces Surtr and is killed.
The exact wording differs among sources and translations, but the key tradition is consistent: Freyr lacks the sword that once belonged to him. This is separate from the question of which weapon Surtr carries; Surtr is associated with a blazing sword of his own.