The Rusty Key
Donate 60 items total to the Museum (minerals and artifacts combined) and Gunter mails you the Rusty Key — it opens the town’s sewer grate. Inside live Krobus (the friendly shadow person who can later become your roommate) and the Statue of Uncertainty for rerolling professions... practically: the Statue of Illusion lets you change professions for 10,000g a try.
The Dark Talisman chain
The sewer also starts the Witch’s questline: the Wizard’s magic ink quest sends you to the Witch’s Hut in the swamp (witch evaporates you without a Dark Talisman), the Goblin problem (give the Goblin a Witch’s... a Void Mayonnaise to pass), and finally the Witch’s Hut interactions that unlock endgame wizardry and the dark shrines.
Why the sewers matter
Krobus as a roommate is one of the game’s most beloved paths (no romance needed — friendship only), the profession reroll is a genuine meta tool, and the swamp chain gates late-game content. The museum donation push that earns the Rusty Key also pairs with the geode processing loop perfectly.
