Dim the lights in Darkness Zones and make players navigate by ghost-light!
Would add some fright to existing modifiers. Should be easy enough to implement, may need to balance how far out the ghost light pierces, or how much the lights are dimmed.
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Would be fun. However, in open areas such as the walker for "Devil's Lair" or the Phogoth boss, the area would be too large for this to take any actual effect, perhaps dimming the brightness to equal that of the moment before a public event.