Kogarasumaru
The Mythic Great Katana
The Kogarasumaru great katana comes with Tachi: Rana. While the relic Great Katana, Amanomurakumo, is still the best one, Square Enix introduced Mythic Weapons, which can be earned by those with a Mercenary Rank of Captain.
The Kogarasumaru starts out as the base weapon, Windslicer. This weapon is a drop from the Nyzul Isle Investigation Assault Mission. You must also obtain a Runic Key (key item) from Floor 100 of Nyzul Isle.
Abquhbah (Aht Urhgan Whitegate, I-10) will hold on to your Windslicer when you do the quest from Naja Salaheem. You begin a quest called Arms of Balrahn, which consists of a series of four quests. As with Relic Weapon upgrades, Mythic Weapons take a long time to acquire. Prepare to do a number of Assaults, Salvages and Einherjar runs.
You can, however, earn Tachi: Rana without a Kogarasumaru — you just need the base weapon and some time. See Tachi: Rana.
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