From Final Fantasy Wiki

"Keeper of the precepts, before whom the mighty are rendered weak."

—In-Game Description

Zodiark (ゾディアーク Zodiāku) is an Esper in Final Fantasy XII: Revenant Wings. He appears in Mission 80: Keeper of Precepts in the Well of Whispered Oaths. During his battle, Zodiark is paired up with some of the most powerful Yarhi in the game. Although there are no Quickenings rewarded for defeating him, the player instead obtains Vaan's second strongest sword, the Ultima Weapon, and Penelo's ultimate staff, the Raqs Sharqi, instead.

Battle

Final Fantasy XII: Revenant Wings Enemy
Zodiark
		Str	Mag	Stm	Mnd	Affinity	30	Melee
		828	826	988	988	Type	Ranged	None
		Atk	MAtk	Def	MDef	Nature	None
		222	221	247	247	Weak Against	None
Level	95	Speed	AtkSpd	MvSpd	Sight	Resistant to	None
HP	6,020	595	27	.54	3.5	Immune to	All

Stat Growth