Earth gloom shouldn't be applying to every single mob. It's a 20% pdi increase, and there are some quests where some mobs have extremely high ac, turning a kind of difficult quest into a massive slog. Other glooms like illusion / frost / acid etc don't apply to every single mob. Why does this one get the exception?
Glooms apply to all mobs, with special abilities applied randomly to a few. Anyway, reduced the physical DI on that specific gloom.