Final Fantasy XII Clan Centurio

When you accept your first hunt, you will be directed to join a group of hunters called Clan Centurio. Their base of operations is located in the North End of Rabanastre. It is owned by a moogle named Montblanc. He is looking for great hunters, who are able to vanquish the beasts that threaten Ivalice. He will give you the thumbs up, and you will be able to partake in special "Elite Hunts", that are given by Montblanc himself.
Also there is more rewards for being a member of the clan. If you gain a new rank within the clan, you will be rewarded. The same holds true for certain bosses you beat, and the amount of Espers you gain. Hey this is one place you want to be a member of. Below is a list of what you will get for defeating bosses and gaining Espers, rank rewards, as well as a list of the Hunts provided by Montblanc.
It is purely optional to join the Clan. You do not need to do so to finish the game. But if you are wanting to get all the hunts complete, or are looking for rewards a plenty...you really do not want to miss joining the club.

Event-based rewards	Clan Centurio Rank
Requirements Reward Defeat Flans 150 gil Defeat Firemane 200 gil Defeat Mimic Queen 300 gil Defeat Demon Wall 600 gil, Warp Mote Defeat Demon Wall 2 1200 gil, Electrum Defeat Earth Tyrant 1200 gil Defeat King Bomb 1300 gil, Mallet Defeat Ahriman 1600 gil Defeat Mandragoras 1600 gil Defeat Rafflesia 1800 gil Defeat Daedalus 1900 gil Defeat Tyrant 1900 gil Defeat Hydro 2000 gil Defeat Humbaba Mistant 2100 gil Defeat Fury 2100 gil, Bacchus Wine Defeat Hell Wyrm 50000 Aquire one Esper 2 Arcana, 2 Teleport Stones Aquire four Espers High Arcana, 2 Teleport Stones Aquire eight Espers Gemsteel, 2 Teleport Stones Aquire Thirteen Espers Serpentarius, 2 Teleport Stones	Rank Name Hunts Points Reward Moppet 0 0 Potion x3 Hedge Knight 2 700 Warp Mote x2 Teleport Stone x2 Rear Guard 4 8000 Remedy x3 Teleport Stone x2 Vanguard 8 20000 Hi Potion x3 Teleport Stone x2 Headhunter 10 30000 Ether x2 Teleport x2 Ward of Justice 12 40000 X-Potion x2 Teleport Stone x2 Brave Companion 10 100000 Hi Ether x2 Teleport Stone x3 Risk Breaker 16 200000 Elixer x2 Teleport Stone x3 Paragon of Justice 24 250000 High Arcana Teleport Stone x3 High Guardian 28 300000 Empyreal Soul Teleport Stone x3 Knight of the Round 32 500000 Megaelixer x2 Teleport Stone x3 Order of Ambrosia 45 1000000 Hero's Badge Teleport Stone x3
Elite Clan Hunts
Little Love on the Big Plains The Cry of it's Power Crime and Punishment Paradise Risen Paramina Run Antlion Infestation Carrot Stalk Battle on the Big Bridge A Dark Rumor Truth Shrouded in Mist Fishy Dreams God or Devil Farewell to a Legend

Clan Primer

The Clan Primer is recieved after you gain your first Hunt. It is part of the main story, so there is no way to not get it. Inside you will find all kinds of helpful information to aid you in the game. From bestiary information to keeping track of your Hunts, the Clan Primer will become a well used asset. Below is some information on each of the different sections.

Hunts

This section of the Primer allows you to view progress on the Hunts that you have accepted. As you complete them, there will be a "Complete" placed across them.
You can access the map showing the location of the petitioner within this section as well as gather the information you were given from accepting the mark. Once you accept the hunt from the petitioner, you will then be given the information from them. Not too much else here. But it is a great tool to use when going after your marks.

Bestiary

The bestiary allows you to keep track of the enemies you defeat. Rather than providing stats for the enemy, you will be given some information and history. This example of Yiazmat provides a great deal of back story to the enemy. It also gives you the genus (type of enemy), in this case an Elite Mark. Then it will provide the classification fo the enemy. This is what type of enemy it is. It could be undead, flying, wolf, etc. In the case of Yiazmat, it is unknown. If it is not known what the classification is, it will be marked with a ???. For the marks, Espers, and bosses, it will display a "Vanquished" line on the bottom, after you have defeated the enemy.
It should also be noted that just because you gain an entry for every enemy in the game, it does not mean you have compeleted the bestiary. Some enemies have more then one entry, which can be opened by defeating more of that type of enemy. It is difficult to know who will have additions, and who will not. But it is fact that all "one-time" enemies will only have a single entry.

Sky Pirates Den

The Sky Pirates Den is simply a place to showcase trophies you earn in the game. Each time you accomplish a certain feat, you will gain a new sprite as well as a new title. It might be for defeating a certain enemy, hitting a certain mark in the game, or gaining a complete something or another. For example, once you cast magic over 200 times, you will get a sprite of Fran, and a title of Spellsinger.
Below is the complete list of possible trophies, and what it will take to get them. To the right is the completed Sky Pirates Den, with every trophy you can get.
There is even a chance of gaining a few of the trophies while playing as Reks in the beginning. You can actually achieve 5 trophies within the small amount of time with Reks, providing you are willing to spend a lot of time doing it. These trophies are marked with a * next to them.

Title	Sprite	Achievment
Exemplar		Reach an average party level of 50
Scrivener		Full Bestiary complete
*Assault Striker		Attack over 300 times
*Blood Dancer		Defeat over 500 enemies
Lord of the Kings		Defeat Behemoth King
High Summoner		Aquire all Espers
Freshmaker		Defeat Carrot
Wayfarer		Take over 50000 steps
Runeweaver		Aquire every spell
Eagle Eye		Defeat Deathgaze
Wyrmslayer		Defeat Fafnir
*Spellsinger		Cast over 200 spells
Mist Walker		Achieve every Concurrance
Master Swordsman		Defeat Gilgamesh (Both times)
Spendthrift		Spend over 1,000,000 Gil
Radiant Savior		Defeat Hell Wyrm
Privateer		Sell 1,000 loot items
Collector		Obtain rare goods on the Bazaar
*The Unrelenting		Achieve a battle chain of 50 or higher
Cartographer		Completely cover every map (Not including one time visit areas)
*Plunderer		Aquired 100,000 gil
Conqueror		Learn all lisences
Record Breaker		Earn 500,000 Clan Points
Sharpshooter		Defeat Trickster
Fell Angel		Defeat Ultima
Master Thief		Steal 50 items
Premier Prestidigitator		Use over 100 Technicks
Jack-of-all-Trades		Aquire all Technicks
Hunter Extroidinaire		Defeat Yiazmat
Zodiark Knight		Defeat Zodiark

Traveler's Tips

This final section fo the Clan Primer is basically the tutorial of the game. If you ever have any questions or concerns about licences, battle, magicks, technicks, etc, this is the place to check. There is actually very little tutorial in comparison to older titles. But then again there is less to go over.