To get a character's 4th and ultimate weapon, that character needs to complete the tactical objectives of a set stage on hard or higher in their story mode. Characters without story mode get their weapons in free mode, with the exception of Takemaru, who has unique requirements for his 4th.
Below are the required stages listed besides the characters who need to clear them for their 4ths.
| Unlockable: | How to unlock: |
| CAW Naginata's 4th | Battle of Hasedo (Date army side) |
| CAW Spear's 4th | Siege of Osaka (Tokugawa army side) |
| CAW Sword's 4th | Battle of Sekigahara (Western army side) |
| Ginchio Tachibana's 4th | Escape from Ishigaki |
| Hanbei Takenaka's 4th | Assault at Chugoku |
| Hanzo Hattori's 4th | Suppression of Odawara |
| Hideyoshi Toyotomi's 4th | Battle of Komaki-Nagakute |
| Ieyasu Tokugawa's 4th | Siege of Osaka |
| Ina's 4th | Battle of Numata Castle |
| Kai's 4th | Riot at Kasai Osaki |
| Kanbei Koroda's 4th | Siege of Osaka |
| Kanetsugu Naoe's 4th | Battle of Hasedo |
| Katsuie Shibata's 4th | Battle of Tedorigawa (Oda army side) |
| Keiji Maeda's 4th | Battle of Hasedo |
| Kenshin Uesugi's 4th | Showdown at Shizugatake |
| Kiyomasa Kato's 4th | Escape from Ishigaki |
| Kotaro Fuma's 4th | Riot at Kasai-Osaki (Toyotomi army side) |
| Kunoichi's 4th | Rescue of Mitsunari |
| Magoichi Saikai's 4th | Battle of Hasedo |
| Masamune Date's 4th | Battle of Hasedo |
| Mitsuhide Akechi's 4th | Battle of Yamazaki |
| Mitsunari Ishida's 4th | Battle of Sekigahara |
| Motochika Chosokabe's 4th | Showdown at Anegawa |
| Motonari Mori's 4th | Battle of Yamazaki |
| Muneshige Tachibana's 4th | Battle of Sekigahara |
| Nagamasa Azai's 4th | Battle of Odani Castle |
| Nene's 4th | Suppression of Odawara |
| No's 4th | Battle of Inabayama Castle (Oda army side) |
| Nobunaga Oda's 4th | Incident at Honnoji |
| Oichi's 4th | Showdown at Yogoko Lakeside |
| Okuni's 4th | Battle of Kizugawa (Oda army side) |
| Ranmaru Mori's 4th | Incident at Honnoji (Oda army side) |
| Sakon Shima's 4th | Battle of Sekigahara |
| Shingen Takeda's 4th | Showdown at Nagashino |
| Tadakatsu Honda's 4th | Battle of Sekigahara |
| Takamaru's 4th | Curiouser and curiouser (third Takamaru only level in Murasame castle, beat on normal, NOT NIGHTMARE) |
| Toshiie Maeda's 4th | Battle of Komaki-Nagakute (Hashiba army side) |
| Uyijasu Hojo's 4th | Kanto Defense |
| Yoshihiro Shimazu's 4th | Breaking through Sekigahara |
| Yoshimoto Imagawa's 4th | Battle of Mimasetouge (Takeda army side) |
| Yukimura Sanada's 4th | Siege of Osaka |