Can the warlock's One with Shadows eldritch invocation be used at will in a Ravenloft game?
One with Shadows
Prerequisite: 5th level
When you are in an area of dim light or darkness, you can use your action to become invisible until you move or take an action or a reaction.
The GM describes that the lands of Barovia barely see any sunlight. Does that qualify as dim light where One With Shadows can be very used at will?
If it can be, is this ability overpowered compared to other invocations in a Ravenloft game?