Aht Urhgan Mission 35: Legacy of the Lost

Walkthrough
Talacca Cove
 * Examine the Rock Slab.
 * 6 members will enter a BCNM against Gessho.
 * BCNM is classified as level capped, buffs will wear upon entering.
 * Uses standard Ninjutsu spells, ranged attacks, and Mijin Gakure.
 * Some of his TP moves seem to be renamed Yagudo special attacks. They are as follows:
 * Hiden Sokyaku
 * Hane Fubuki
 * Rinpyotosha (Howl; Warcry)
 * Happobarai
 * Shiko no Mitate (Parry; Defense Boost)
 * Shibaraku (Sweep; 500-1000 AOE damage and Stun)
 * Periodically teleports around the arena.
 * Usually uses one of his TP abilities upon reappearing.
 * Spawns 3-6 weak clones of himself, trigger condition unknown, each clone has 2,000 HP.
 * Clones can use Gessho's special abilities and Ninjutsu.
 * Clones de-spawn after 10-20 seconds. They share their initial target with the original but hate is not linked. It is possible for a buffed Red Mage to Diaga and kite them off the tank until they de-spawn.
 * The clones seem to use Mijin Gakure in conjunction with Gessho himself. The clones do not stay alive long enough to Mijin Gakure if they are allowed to de-spawn.  It is suggested to cease dealing damage to Gessho until the clones de-spawn preventing Mijin Gakure being triggered.
 * He can do this more than once in a battle.
 * Gessho and clones are immune to Sleep (Even with Elemental Seal) and Lullaby.
 * Susceptible to Paralyze, Slow, and Blind. Becomes more resistant to Bind as the fight progresses but it does stick.
 * He Seems to Mijin Gakure at 18% health. (Party whiped first time from Mijin Gakure at 18% and he did it again then 2nd run, but mages DoT'd him before we wiped again, RR up and hit him for the last couple %)
 * He can Mijin Gakure more than once in a battle.
 * He gives up around 15% health.
 * He has an incredibly slow regeneration rate while unclaimed, but it seems to speed up over time. He will typically be fully healed in the time it takes a party to reraise and unweaken.
 * NOTE: If you have already successfully completed this mission, it is not necessary to return to the cutter or obtain another coin. Instead, go to Nashmau and take the west exit. Zone to Talacca Cove and go west following the south wall. In the north west corner you will find the Rock Slab where you enter the BCNM.

Game Description

 * Mission Orders:

You have been ordered to guard the treasury of Ephramad. But first, you must find the hidden treasury, concealed somewhere inside Talacca Cove...