How do I get the weapons on samurai warriors?

how do you get the 5th and 6th wepons 4 samurai warrors xtreme legends?

Hi,

You must play on the Hard or Chaos difficulty to obtain 5th weapons, but you can spend your points to be able to get them on Normal difficulty.

For the 6th weapons, you must play on Chaos difficulty, but you can spend your
points to be able to get them on the Hard difficulty.

Also, if you get a character's sixth weapon, you may start to find their fifth
weapon randomly like you would their first four weapons. And also, the weapon's
stats will be randomly generated so you may find an even better fifth weapon
than your actual one.

I know that im talking about mission info to get a spasific characters wepon