Shop discount:
To get a discount at the merchant and shop, collect all 12 gems. A short intermission sequence will play after collecting the last gem.

Unlock bonus weapons:
You will be able to purchase weapons from the Dynasty Warriors and Samurai Warriors after beating the game.

You will unlock a super weapon after reaching 100% growth on a weapon.

Unlock excalibur sword:
To unlock the single handed sword Excalibur (Edge: 99, Point: 99, everything else 0), beat the game as England.

Unlock durandal sword:
To unlock the two-handed sword Durandal (Edge: 99, Point: 99, Blunt: 99, Magic: 99, everything else 0), beat the game as France.