Conversation so far:
What were the Twilight years for Sandman (Wesley Dodds)?
Wesley Dodds and his JSA teammates enter into a limbo to engage in an eternal battle that would allow the universe to continue its existence.
What happened during the Sandman's (Wesley Dodds) twilight years?
The Armageddon: Inferno mini-series ended with the JSA members leaving limbo and entering the 'real' world.
What did Sandman (Wesley Dodds) do in the 'real' world?
For the Sandman, the Justice Society of America (1992–1993) depicted him as an old, thin man with a balding scalp and a sharp wit.
Was Sandman (Wesley Dodds) still a superhero in the real world?
Sandman's sidekick, Sandy the Golden Boy, becomes known as Sand and takes his mentor's place as a member of the Justice Society of America as well as his prophetic dreams.

Question: Who was his mentor?
Self-contained rewrite: Who was Sand's mentor?