The 
Blaggi Sword（ブラギの剣 Bulagi no Tsurugi）is a holy sword capable of nullifying the Loputo Sword's halving attack effect. It is initially possessed by Sety, who hands it over to Cyas to give to Leaf before entering Manster castle. According to Cyas, only those with holy blood can wield the sword, but Galzus and Mareeta cannot use it despite hailing from Rivough, a branch of the Isaac royal family. It is highly recommended that Leaf gets the sword since Leaf is unmounted, while Nanna, Felgus, and Delmud are not, and Leidrick and Eins, the former being the wielder of the Loputo Sword, and the latter being the dark warlord of the former, are fought inside. Also, Leaf is guaranteed to start just below Eins, while the other three could start anywhere, thus it is obviously equipped to Leaf. Also, it is unknown what Crusader Blaggi has to do with this sword, but since the Loputo Sword is "cursed" by the Loputo Sect, the Blaggi Sword is most likely "blessed" by Blaggi.
FE5
Weapon Type: Sword
Weapon Rank: *
Mt: 15
Hit: 70
Crit: 0
Wt: 12
Range: 1
Uses: 60
Worth: N/A
Effect: Negates Loputo Sword's special ability, effected against armored units, grants Prayer skill, Leaf, Nanna, Felgus, Delmud only.