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See Invisibility
You can see any objects or beings that are invisible within your range of vision, as well as any that are ethereal, as if they were normally visible. Such creatures are visible to you as translucent shapes, allowing you easily to discern the difference between visible, invisible, and ethereal creatures.
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Ethereal Plane
The Ethereal Plane is home to phantasmal creatures such as ghosts, as well as things born from the dreams of mortals. It is also the home of night hags and the xill.
So when you cast 'See Invisibility' you see lots of weird stuff beside just people who are invisible. Xill going about their daily lives, ghost, night hag covens, cast off mortal dreams all roaming around...
Would permanent see invisibility just drive you mad?
