As with all Heroes' Relics, if the user does not have a Crest, the bow deals 10 damage to the user after combat if used.
Accelerates Special trigger (cooldown count -1). Effective against flying foes. At start of combat, if unit’s HP > equals 25%, grants Atk/Spd/Def/Res +5 to unit during combat and neutralizes effects that guarantee foe’s follow-up attacks and effects that prevent unit’s follow-up attacks during combat.
|Inventory||Chapter 13 (Verdant Wind) - Claude|
|Event||Chapter 19 (Azure Moon) - End of chapter|
|Inventory (Unobtainable)||Chapter 22 (Verdant Wind) - Riegan|
Super Smash Bros.
Failnaught appears as one of the many weapons wielded by Byleth in Super Smash Bros. Ultimate. Failnaught is used as Byleth's neutral aerial, as well as their neutral special. With Byleth's neutral special, they can charge up an arrow up to two tiers. The first tier can be canceled by shielding or jumping, and can be turned around to fire in the opposite direction. The second tier forces Byleth to be rooted to the spot in exchange for great power and is capable of breaking near-full shields.
If Kirby were to use Inhale on Byleth, he is also able to wield Failnaught.
Failnaught is named after Fail-not, the bow wielded by Tristan, a Knight of the Round Table in Arthurian legend.