Dood Trigger™
Quote from Glenn Magus Harvey:
Do they have like 120 different messages for each of the souls?
They use the enemy descriptions from the bestiary.
Hammer's shop is unlocked the usual way, by beating the armor boss in the library. But then the contents are totally random. You can get Claimh Solais there or just... knives and a bunch of rotten heals, haha.