Everyone remember the raid gear from D1? Vault of glass armor and weapons were specific to the raid, it helped you out with specific parts of the raid. In Crota the armor pieces helped you out with parts of the riad. This little bit of design made the gear worth getting. So i say for the Leviathan make the Gear specific to the raid.
Lets say legs that make you silent to the dogs or run faster in the gauntlet.
Lets say a specific weapon does more damage to the jars in the bath house.
Armor piece that makes you run faster in the gauntlet while holding the orb.
Armor piece or weapon that makes you deal more damage to the big guys in the bath house.
These are just a few changes id like to see to make us wanting to do the raid. Thats something that made me keep wanting to raid in D1.