Crohasit ((install))

To help you effectively, could you please clarify:

Elias wrapped the Crohasit in a simple cloth. He placed it in his pocket, ignoring the ledger. He walked out of the library, past the sleeping security guard, and into the rain. crohasit

It was a repository of human regret.

If so, which one, and what is the intended meaning? To help you effectively, could you please clarify: