Scent of a Kobold

Discover who let the kobolds into Gullykin.

If you finish the Firewine Bridge and exit the dungeon from the final fight's room, you will reach a basement in Gullykin. Question the NPC there as to why it smells like kobolds.

Alternatively, you can find the same place by searching the houses in Gullykin. There is a named house with a hidden passage at the basement, behind a bookcase.