1. Receive the quest of legendary weapons in Blade & Soul (KR) and then talk to Two Forms Householder (the senior male character who taught you the Qinggong “Leap onto Roofs and Vault over Walls”) in Misty Forest. After that, you need to find Su-wol Plain great hero card Exchange Man in Sun Tree Village and exchange Versatile Dutiful Hand with 100 Su-wol Plain great hero cards. In the end, you need to go back to Fog Forest and hand it to Two Forms Householder.
There are many ways to get Blade & Soul Su-wol Plain great hero card. And I suggest you to finish daily quests of Su-wol Plain and farm Su-wol Plain small hero card at Yang Shizu Base or Suwa Palace and then farm Su-wol Plain great hero card at Gyeong Cheon Maeng East Base (get Empire Uniform).
2. Teleport to Tower of Mushin and find Cloud Master.
3. Teleport to Confucian Village of Great Desert and find Gong Tuxi.
4. Teleport to Five Color Stone Island and find Gao Tangsheng.
5. Teleport to New Moon Lake of Desert Zone, and give 5000 gold to Ying Jianan.
6. Bring the item given by Ying Jianan to Two Forms Householder. Go to find Hong Yanlang in Surveillance Outpost of Misty Forest and exchange 400 Imperial Army's Seals and 400 Gyeong Cheon Maeng Seals for Magic Unlock Rune. Then bring the rune to Two Forms Householder.
Way to get Gyeong Cheon Maeng Seals: Put on Empire Uniform and fight in Gyeong Cheon Maeng base camp until Cheng Hedao(程河道) shows up. You can get Gyeong Cheon Maeng Seals by defeating Cheng Hedao.
Way to get Imperial Army's Seals: Put on Gyeong Cheon Maeng Outfit which can be exchanged by 50 Gyeong Cheon Maeng Seals from Hong Yanlang, and fight in Gyeong Cheon Maeng base camp until Dragon Ball appears. You can get Imperial Army’s Seals by defeating Dragon Ball.
7. After handing in Magic Unlock Rune to Two Forms Householder, go to buy Black Dragon Stove from the Weapon Merchant in Suwa Remains of Half-moon Lake with 800 Soul Stone and 3000 gold. Bring the stove to Two Forms Householder, and he gives you an uncompleted weapon.
8. Teleport to Sun Tree Village and exchange 1000 gold + 3 Nayu gold or 120 Nayu silver for Black Dragon Heavy Water from Nayu Country Gold Exchange Man. Bring the heavy water to Two Forms Householder, and he gives you a better weapon.
9. Teleport to Sun Tree Village, exchange 1000 gold + 30 Pirate Logo or 1000 gold + 40 Pirate Loot for Very Fine Abrasive from Pirate Loot Exchange Man. Bring the abrasive to Two Forms Householder, and he gives you another better weapon.
10. Teleport to Factions' Command of Camp in Misty Forest, and exchange 2000 gold + 600 Misty Forest Faction Seals or 2000 gold + 48 Superior Misty Forest Faction Seals for Marvelous Small Bo-Pae Pieces from Factions' Exchange Merchant. Bring the Bo-Pae Pieces to Liang Yi Jushi and he gives you a legendary weapon, but not the final one.
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