A holy sword spoken of in a far away world. Called by different names in various tales, it is said to unleash its true power only when the world falls into chaos. When the ancient weapon Mana Fortress showed signs of reawakening it angered the gods, at which time this sword chose a timid young boy from Potos Village to whom it bestowed its power.Final Fantasy Brave Exvius description
Called Excalibur, the canonical Mana Sword has its origins in this game. It is an evolution of the Rusty Sword, and is obtained near the end of the game.
Mana Blade is a Sword that is obtained as Randi's Trust Master. It provides 101 ATK, 8 DEF, 8 MAG, and 8 SPR.
The Mana Sword stems from its own series, being the eponymous sacred sword of the Mana Goddess of the world of Fa'Diel. Much like how crystals are a major story foci of Final Fantasy, the Mana Sword plays a similar role within the Mana series, and has different incarnations in each of its installments.