This is a guide to beating the Boss Leviathan in the game Final Fantasy VII Rebirth (FF7R). This article explains Leviathan’s attack patterns, weaknesses, and tips and strategies for defeating it.
How to Beat Leviathan in Final Fantasy VII Rebirth (FF7R)

Equip Healing and Magnify Materia
We recommend equipping a character with a Healing Materia boosted with Magnify to allow for party healing for this battle.
Leviathan’s attacks have a wide range and it’s very easy for several of your characters to be low on health at the same time, so take advantage of Magnify and keep everyone’s HP up.
Stick close to Leviathan
Try to fight with your party members as closely together as possible, and stick close to Leviathan as well. This allows you to heal everyone, and Briny Bellow will miss and give you a great opening to attack it in.
Use Barret after Tidal Roar
Once Leviathan uses Tidal Roar and flies up above you, you’ll want to switch to Barret as no one else can reach it.
If you manage to Stagger it, the water spouts will disappear and it’ll fall to the ground, giving you a chance to attack it.

Guard when you see Attack names
Since all Leviathan’s attack animations are long, you have plenty of time to block once you see the attack names appear on the screen.
Even if the attacks are slow, most of them hit very hard and can easily take out big chunks of your HP, so keep your guard up!