A KING'S TALE: FINAL FANTASY XV

After claiming Clarus as your final party member and running through the caves, you'll come to the final chamber (a larger map than the previous). Clearing your way through this, you'll come to the cause of all the disturbances in Insomnia and Duscae. It is a three-stage fight with each repeating in the same way.

Phase 1 starts out with three tentacles wrapped around the pillars and some exposed and lounging around on the battlefield. Concentrate your firepower on all of these, building up Armiger and your bonds as necessary. It is not recommended to hold on to either, as it is a scripted stage fight. Once you fell all of the tentacles, the boss will shake the ground and let loose a hail of stone; dodge roll out of the way and let the enemies take the hits, then dash in and take some swipes at the boss when it is hit with the attack.

Phase 2 and 3 repeat the same way, but you will have more enemies to worry about around you (and to build your Armiger up if necessary). Once you fell it once in Phase 3, it will shake loose the crystal from Insomnia and attempt to pull it towards itself. This is your cue to take out all of your rage on the tentacled fiend by striking at the one pulling the crystal towards it. Once you deplete the health, you will summon Leviathan and finish the fight.