Although it is not crucial in winning the game, it just feels great to have the best weapon for every character so that killing every enemy will be a breeze. In Final Fantasy 12, the last installment of the series on PS2, the strongest weapon happens to be a spear named the Zodiac Spear.
There are two ways to obtain this weapon. One method can be used to obtain it at quite an early stage of the game, while the other requires you to wait a bit longer.
For the first method of obtaining the Zodiac Spear, there is a rule that you have to follow or else you this method will not work. You must not open four specific chests from the beginning of the game until reaching the Necrohol of Nabudis where the spear is located. The four chests are:
1. The chest in front of Old Dalan's place at the southern end of Rabanastre Lowtown.
2. The chest in the Rabanastre Palace Cellar. Do not open the one at the southeast corner of the map. There will be either one or two chests that may appear there. To be safe, don't open any of them.
3. The chest in the room at Nalbina Dungeons where you regain all your equipment back. There are more than one chest in the room so to be safe, just don't open any of them.
4. The chest at the eastern-most section of the Phon Coast. There are 16 chests there arranged neatly near the shore. Don't open any of them.
After you've resisted the urge to open these chests, the next is finding the Zodiac Spear which is located in the Necrohol of Nabudis. At the early stage of the game, do not fight any of the enemy here or you'll die instantly. The strategy is to run as fast as you can while evading any of the attacks.
Once you enter the Necrohol of Nabudis, run for your life until you reach the Cloister of the Highborn. You can check the map to know where you are. From where you come in, take a right turn and then the next left. Run along a corridor heading north then take the first left. There should be 16 chests in this room, one of which contains the Zodiac Spear. The Zodiac Spear chest is the second chest from the left in the first row. If the spear is not there, you must have opened any of the forbidden chest mentioned earlier.
Remember, this is a one time opportunity only. If you have opened any of the chest mentioned before, you will never get the Zodiac Spear this way.
The other way of getting the Zodiac Spear is extremely difficult and time consuming as you rely on the chances of the Zodiac Spear appears in a chest in Henne Mines. The chest has a 10 percent chance to spawn, a 10 percent chance to contain an item and 10 percent chance to contain the Zodiac Spear. So theoretically, you're facing a 1/1000 chance of getting the Zodiac Spear from the chest.
If you're the unlucky ones to miss the first method, then what you need to do is to defeat 10 espers and complete the Mineflayer hunt. Then speak to the Geomancer in Jahara to have someone open up a secret area in Henne Mines. Get to the Phase 2 Dig area and look for an area not shown on the map. The chest can either be there or not. If it's there, equip diamond armlet before you open it to be able to get the Zodiac Spear.
It is obvious that opting for the first method is much quicker and easier. If you're into perfection and love to collect all the weapons in the game, then obtaining Zodiac Spear is a must. Killing all enemies can never be easier with this weapon around. Good luck in obtaining this excellent equipment and enjoy the game as never before.