Act 3
Eternal Blue SkyStory*** Spoiler - click to reveal ***You'll eventually learn that the Khan is in Izumi Port, readying his poison to take down the mainland and the Shogun. The quest is fairly easy and the Khan doesn't put too much of a fight up really.
You'll fight waves of enemies until you go to meet Norio at the frontlines. From here you'll need to stealthily get to the Watchtower. Climb the first building in front of you an enemy should be able to see you, hit him with a poison dart and proceed through the level. You'll shortly have to return to ground level, to you right is a group of enemies and to your left a fence with a drop. Jump the fence and climb the cliff at the end and then quickly head across the road and hide behind the timber. Use a hallucigenic dart on the archer as you peer out of the nook and wait for him to kill the guard by the tower. Once that is down hit him with a poison dart and climb the tower.
You're uncle will appear during a cutscene, afterward fight your way through the ?ongols to reach a duel with the Khan. The duel is like any other, except his chain of attack is much longer if you make a mistake. Once he gets close to dying, he'll poison you and run behind more Mongols, simply keep moving through, the poison will make you stop, but once you reach the ship the real boss battle begins.
After each time you best him, his weaponary will become more useless and more Mongols will spawn to help him. Always deal with the adds first. Especially Dual swordsman and archers. Once he is near death a quick time event will occur, you' only need tl hit so don't worry too much, the rest of the mission is exposition and it'll pop after a conversation with Yuna.
GearI used a fully leveled Ghost armour, took plenty of smoke bombs to help not only with healing, but it also helped thin Mongols out quicker. Sticky bombs also helped alot during the final battle.
CharmsCharm of Okuninushi
Charm of unseen respite
Charm of Devine Healing
Charm of Inari's might
Charm of Resistance II
Charm of vitality.