All ideas with Dark7 as a contributor

Muzzle: a tool that can be applied to an adjacent hostile monster to attempt to muzzle it. Success depends on your Strength and Dexterity, and if you do muzzle the monster, any bite attacks it has are prevented from happening.

New shop type “boutique”, which only generates in very small rooms (otherwise it’s converted to a general store) and sells not-very-useful items at highly inflated prices. Also, other sorts of shops that are suitably small and have no useful items in them may be converted to boutiques. They have unique level sounds, such as “You hear a watch ticking” and “You hear someone pouring a cup of coffee”.