Non-Detection protects against Detect Invisibility and Invisibility Purge but not against any other revealing spells, such as Oracle, True Sight or Detect Illusion. The Cloak of Non-Detection however casts a non-dispellable version of Non-Detection over the wearer that nothing can remove. Only the Cloak can maintain invisibility against the higher illusion dispelling spells, the spell itself is actually quite crappy.
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