These weapons have no real owner thus you can use whoever you want with whatever weapon you want to obtain the 5th weapon. When you initially buy the Weapon System Pack for the weapon you can get free 1st-4th weapons from the Blacksmith with no skills tempered onto them. They come with their acquisition battle when you buy the pack which is where you will get their 5th weapon, it must be played on Hard or Chaos.

Flame Blade

Weapon System Pack: 1
Weapon Name and Skills: Phoenix Fire Blade - Flash: 10, Thorns: 9, Uplift: 9, Vigor: 9
Requirement: Defeat Dian Wei when he arrives as reinforcement.

Revolving Crossbow

Weapon System Pack: 1
Weapon Name and Skills: Binding Crossbow - Cyclone: 10, Protection: 9, Frenzy: 9, Jolt: 9
Requirement: Defeat the supply captain that leaves the castle from the southwest before he reaches the southeast exit.

Sabatons

Weapon System Pack: 2
Weapon Name and Skills: Dragon Foot - Frost: 10, Fear: 9, Induction: 9, Thorns: 9
Requirement: Get 400 KOs then defeat Sun Shangxiang.

Eimei Piercers

Weapon System Pack: 2
Weapon Name and Skills: Immortal Piercer - Whirlwind: 10, Aggression (Same affinity = Attack up): 9, Jubilation: 9, Vigor: 9
Requirement: Get 400 KOs then defeat Lu Bu.

Bladebow

Weapon System Pack: 3
Weapon Name and Skills: Phoenix Wing - Slash 10, Awe: 9, Swiftness, Enlightenment: 9
Requirement: Get 400 KOs then defeat Bao Sanniang.

Paired Fans

Weapon System Pack: 3
Weapon Name and Skills: Soaring Dance - Venom: 10, Recovery: 9, Chain: 9, Barricade: 9
Requirement: Get 400 KOs then defeat Sun Ce.