Fólkvangr

Fólkvangr (フォールクヴァング Fōrukubangu) is a legendary weapon that appears in Fire Emblem Heroes.

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Fólkvangr is the personal sword of Prince Alfonse of Askr. It has not been properly introduced in the series yet. The sword's design is very similar to Awakening's Falchion. Fólkvangr's edges are coated in gold, while the grip has a glowing blue crystal. Fólkvangr emits a blue light when performing a critical.

Etymology
Fólkvangr in Norse mythology is a field in Asgard where goddess Freyja rules over half of those who die in combat.

Trivia

 * The Fólkvangr was launched in Miitomo as an in-game which accesory which can be bought for 3500 coins as part of the Fire Emblem campaign.
 * It is not available as a skill for [two stars] Alfonse.
 * It may be safe to assume it is one of the legendary weapons of Askr along with Sharena's lance and Commander Anna's axe.