Lower Society Damage in shells right now is completely useless, since this effect works on Catsies and Kovolts, they only exist in act1 and act 2, Shelled items are usually only after act4, so this effect probably has never been once used.
So it would be very good if it was reworked for % damage to something else, there are new races like Draconians, Dragons, etc... Or it could even be changed to damage to low-level monsters in Celestial Lair/Land of Life