None

37000

0

28000

174

99

17

27

1

0

8

60

47

Steal/50% Drop: Potion
33% Drop: Potion
16% Drop: Potion
2% Drop: Potion

0

None

None

None

None

The battle with this god of water will make the battle you just had with Asura seem like a day at the beach. Now there's still a beach, but it's hurricane season. Leviatan has two stances, we'll call them open and closed - the difference is in his position, and you'll notice the difference right away. He starts off closed, but opens up right away. This is where he pulls off his potential coup de grâce, Big Wave. It punishes your party for a fair amount of damage. He'll then revert back to his closed stance where he casts Ice2 and slugs you with his normal attack at will. Leviatan has a crazy amount of agility, meaning he can pull off multiple moves before any of your characters can bust out consecutive attacks.
The strategy is simple enough, however. Have Cecil lay into the serpent with his sword attack. Levy's big weakness, obviously being of water element, is lightning. So have Edge cast Blitz for some hefty damage. Edge doesn't have a lot of MP, so when he runs out, don't waste an Ether1; just have him attack with his swords. Rydia will alternate between blasting him with Bolt2 and Ramuh. The combo of Edge's Blitz and Rydia's lightning attacks are quite the potent one-two punch, so keep it coming. Rosa's job is obvious, and that's to make sure everyone is top notch in HP. Keep this going for a dozen turns or so and he'll be no match for you. Take heed that, like his wife, Leviatan has a load of HP, so it might take few times going through the lineup before he goes down.