You can earn a level 5 weapon on any difficulty setting:
Hanzou Hattori
Weapon: Night Fang "Underworld"
Stats: Base Attack 46, Night Element, Musou +40, Ranged Attack +45, Movement +42, Jump +32
In the battle of Mikatagahara, the general objective is to withstand the Takeda army's battle formation. Once the stage starts, lure Naitou Toyomasa and Yamagata Masakage forward and defeat them. Then, defeat Oyamada Nobushige and immediately move towards Baba Nobufusa's location. Defeat him without letting Hirote Hirohide get defeated. Anayama Nobukimi and Takeda Katsuyori will come towards you; defeat them as well. You cannot allow any of your allies be defeated. Infiltrate the enemy camp using the ninja route, then take all the enemy gates and the supply team will appear. They appear slightly to the east of your home camp and move west. Defeat the captain for the weapon. Shingen will start retreating once you take all of the gates. It may be prudent to wait until your allies are close to his camp before taking the last gate to get in his way.
Keiji Maeda
Weapon: Jeweled Halberd of Heaven
Stats: Base Attack 50, Lightning Element, Life +50, Attack +46, Mounted Attack +44, Musou Gain +25
In the Test of Kawanakajima defeat all enemy generals and subgenerals except for the commander. The supply team will show up in the southwest and move towards the north exit point. Defeat the captain for the weapon.
Kunoichi
Weapon: Kushinada
Stats: Base Attack +45, Ice Element, Life +37, Musou +45, Ranged Defense +49, Jump +29
Kunoichi's weapon is very easy to get, because you do not have to kill anyone.. In the Rescue Of Ueda Castle, reach the fifth floor in less than three minutes without defeating any enemies. A precious item report will appear. Go to the northwest, and the weapon will be in one of the rooms there.
Masamune Date
Weapon: Periwinkle "Mikaboshi"
Stats: Base Attack 46, Ice Element, Attack +45, Mounted Attack +35, Musou Gain +32, Attack Radius +39
In the Intrusion of Honnouji, arrive at the temple before Mitsuhide. Defeat Mitsuhide's generals, then defeat Mitsuhide himself. Next, defeat all of Nobunaga's generals and subgenerals. Complete all this without any of your own generals having lost and the supply team will appear in the temple, running for Nobunaga's exit point. Defeat the captain to pick up the weapon.
Mitsuhide Akechi
Weapon: Sacred Sword "Futsumitama"
Stats: Base Attack 47, Lightning Element, Attack +42, Musou +37, Defense...
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