See The Unseen

Least Invocation; 2nd
When you use this invocation, you can activate great powers of vision, allowing you to see invisible creatures and objects (as see invisibility). You also gain darkvision out to 60 feet for a period of 24 hours.

Source: Complete Arcane

See Invisibility

Level: Brd 3, Sor/Wiz 2
Components: V, S, M
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 10 min./level (D)

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. The spell does not reveal the method used to obtain invisibility. It does not reveal illusions or enable you to see through opaque objects. It does not reveal creatures who are simply hiding, concealed, or otherwise hard to see.
See invisibility can be made permanent with a permanency spell.
Material Components: A pinch of talc and a small sprinkling of powdered silver.

Source: Player's Handbook

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