|**Available:** Complete The Beginning of the End **Location:** Concordia; Bounty Board **Level:** 28 **Rewards:** 6983 XP, 967 dollars, SMG|
As you will soon find out, this is the hardest mission in the game, as it's the raid boss. If you've already heard, it is indeed the final boss of the main story, only stronger and with more health. There's just one slight difference, though, as you will need to pay an entry fee of 20 Moonstones at the entrance to the boss before you're allowed to actually enter.
If you die (and you might), then you will not need the pay the fee of 20 Moonstones again and will be able to attempt the boss over and over. Of course, you will have to fight from the very first phase, as it doesn't save your progress in the fight. There are three ways to fight the boss, either solo, with others or via using the infinite shield glitch.
Going solo or with a group will require some pretty strong weapons, a good shield and probably some way to regenerate health. Remember that the boss is the EXACT same, so you have to go through four phases with the normal Sentinel and then three with the Empyrean Sentinel. It's a long fight, but ammo will still drop from the spots on the ground.
Infinite Shield Glitch
This should only really be used as a last resort, as it makes the raid boss pitifully easy. The only problem is that this might happen to you without you even really wanting it to happen, since it centers around the Opha enemies in Eleseer. There doesn't seem to be an exact method that recreates it, but it has been found it revolves around the Ophas and the Puttis they spit out.
Basically, Ophas will spit out Puttis to attack you, spawn the turrets, as well as replenish their shields. One idea is that whenever they replenish an Opha's shield, killing them afterwards will trigger the glitch to make your shield instantly replenish. This can be done multiple times to stack the glitch, making it nearly impossible for enemies to deplete your shields.
Warning: There is no guarantee that the infinite shield glitch will always remain in the game, as it could likely be fixed in a patch.