The scribe crown lets you grow more powerful based on how long you play the game - thus the longer you play, the more powerful you'll become.
The Ninja Crown lets you evade enemies - so you'll encounter fewer enemies. As you level up the crown, you'll encounter fewer enemies.
With the Sage Crown, you can enhance the effects of Magic (both white and black magic).
Four Final Crowns Towers
The crowns are at the top of the following towers.Tower 1: North of Home and the Witches Manor
Tower 2: In the water area, South of Invidia and north of Tower 1. You need a ship to get to it.
Tower 3: Is in the town of Liberte. From your boat at the Northern most part of the town.
Tower 4: It's on the landmass in the Northeast - around Spelvia.
Freelancer - You get this at the start of the game
Wayfarer - Witch's Mansion / Defeat Greaps
White Mage - Quicksand Castle / Defeat Sand Devil
Black Mage - Quicksand Castle / Defeat Sand Devil
Bandit - Animal Burrow / Let Ogre Bear win
Bard - Animal Burrow / Let Ogre Bear win
Merchant - Urbeth / Defeat Demon
Salve-maker - Urbeth / Defeat Demon
Elementalist - Arbor's Great Tree / Defeat Arbaroc
Ranger - Arbor's Great Tree / Defeat Arbaroc
Fighter - Invidia Underground / Defeat Ice Dragon
Scholar - Invidia Underground / Defeat Ice Dragon
Party Host - Spelvia's Throne Room / Defeat Rolan
Hero - Spelvia's Throne Room / Defeat Rolan
Spell Fencer - Quicksand Castle / Defeat Asmodeus
Monk - Mount Gulg / Defeat Belphegor
Dancer - Overworld with Cestus / Defeat Leviathan
Paladin - Rolan's Soul / Defeat Lucifer
Alchemist - Tower of the Sky / Defeat Beelzebub
Shaman - Sun Temple / Defeat Mammon
Dark Fencer - Magic Laboratory / Defeat Satan
Seamstress - Urbeth Weapon Shop / Gain 20,000 Gil by selling at the
Beastmaster - Invidia / Win 257 or more points in the math game
Musician - Liberte Wireless Shop / Buy the Music Score (2,500)