[Autumn]

Null Shell's charged effect is a little too strong and reliable given the current limitations of nulls, you'll never see nulls like requinite or wash away or pressure filch having this amount of power, given Null Shell's charged effect is easier to proc with spark drive as well it can basically deny you statuses every single turn if the MG wants to, and if they're particularly devious, it can even proc twice in a round by using Charged shot first combined with Spark Drive.

I think that simply put, Null Shell's overcharge effect and its charged shot effect could be swapped, that way it gives the actually "Dispelling" part of null shell a makeshift cooldown, similarly to most other nulls in the game with their limitations.