The Heir to the Light

How to obtain this mission
Repeat San d'Oria Mission 1-2 or San d'Oria Mission 3-2 until your final mission is listed in the mission list. This will happen after repeating Mission 1-2 10 times.

Walkthrough
After accepting the mission, zone into Northern San d'Oria. A long cutscene will occur. At the end of the cutscene, zone into the castle. Another cutscene will begin. After this cutscene, talk to the King. You will be given orders to head to Qu'Bia Arena.

Now gather a full party of level 70. One of the party members must be a BLM that has Sleepga II. Mages should have Yaguado drinks and Melees should carry Icarus Wing, regen drinks, and H-Potions. Everyone should carry a poison potion.

Enter Fei'Yin and you will encounter a cutscene. Make your way to Qu'Bia Arena. Once the party is ready, enter the uncapped BCNM.

Upon entering the BCNM, an event will begin. Once you appear in the battlefield, cast your prefight buffs.

Part 1 of this BCNM will consist of 1 Warmachine, 1 RNG orc, and 13 other orcs. Have your tank round up all the orcs for the BLM to Elemental Seal + Sleepga II. The order should go Warmachine > RNG > remaining orcs. It does not matter on which orc you do next after the RNG is dead. They are easy prey. Keep a weak one alive and slept and rest to full. Killing the final orc will trigger an event.

For Part 2, Prince Trion will join you. Mages must keep him alive, as if he falls, your party will be ejected from the battlefield. Prince Trion will not wait, so follow him. This part of the BCNM will consist of 3 Orcs:

Warlord Rojgnoj (PLD) Rojgnoj's Left Hand (BLM) Rojgnoj's Right Hand (DRK)

The desired order should be BLM - PLD - DRK. However, Trion will randomly attack one of them. Pray that he does not attack Rojgnoj's Right Hand. The tank should engage with the PLD (as he will simply resist sleep), while the rest of the melee defeat Rojgnoj's Left Hand as fast as they can (using Icarus Wings and their 2hr abilities if necessary) because he will simply use aga spells. The orc that is not being attacked should be slept. The RDM should keep Trion alive. Once all three orcs are dead, another event will occur.

Now return to the castle for an cutscene. After this cutscene, go to the door in King Ranperre's Tomb (same door you went to in Mission 6-2) for another cutscene. Report back to the castle for your reward.

Reward
Rank 10, 100,000 gil, and San d'Orian Flag