A mysterious prophet who speaks in riddles.

'Everybody knows that!' -Mantra of knowitalls everywhere.

Everybody must be the wisest person in all of Creation, because he seems to know everything!

Known throughout the land for his miracle elixir. Worshipped by the poor, envied by the rich, the miracles follow him as he travels, or so he would have everyone believe.

A disembodied hand enthralled by an evil wizard to fetch books for him.

Yes, it's the wise old man you alway knew you'd meet.

A less-traditional NPC, a magical creature, formerly a tree. Might function as a druid or hermit.

A mighty tree it was, giving shelter to wanderers and many birds, until one night two dragons battled on the sky, right over him. Their motives are unknown, but the loser fell to his death on the tree, and that, broken and burned with the acidic blood of one and the fiery breath of other become what it is now.

A shaman like man appears out of nowhere and asks if any of the PCs have ever heard of him.