Level: 100

Health: 10000

Atk: 1000-2000

Defence: 90% physical and all elemental damage reduction (no damage reduction against underbelly)

Strength: It's unforgiving high damage can easily one shot weary players, and not only it has a high physical defence stats, it all has a high defensive stats against all elemental damage. And for a massive creature, it is fairly nimble and has a decent speed, as the players facing it would be confined to his territory. 

Weakness: Dragaon's often have very few weakness, and usually there only weakness is their soft under belly and in this case is no exception as well. Players could also work together and use the terrain to their advantage, and classes such as assassins can easily out maneuver the boss.