To get this, you'll need The Lost Hobo King Adventure DLC, worth 400MSP.
You need to reunite the 3 Hobo Blacksmiths to forge the Hobo King's Crown. Starting at the statue in the center of the town, you'll find the 3 blacksmiths West, North (under the castle), and East. I'll give only 1 solution per blacksmith, and let you find the others :)
1. West, the flying mansion = Using the shaman, use the ability to read the runes on the floor (trigger that makes the mansion lift). You'll see three spots, where you need to place dolls. Place 3 dolls in the right spots and the mansion will become accessible.
2. North, the ghouls = simply evade the ghouls with any doll. You'll need to open the two gates, by stacking on the proper devices.
3. East, the sardine knight = Find the wannabe knight, and go see the guy that puts buckets on dolls' heads (he is at the entrance of this particular area). Using his ability, put a bucket on the knight's head. Then, using the knight, go see the fortune teller near the 3rd blacksmith. She will grant you a shield, which you can use to open the sardine can.
Once all blacksmiths are free, go to the castle (over the passage to the ghouls). Use the shaman to read the runes, and put the blacksmiths on their respective runes (small=water, medium=frying pan, tall=fire).
Once in the crown room, use the Fire blacksmith to heat the cauldron, use the Frying pan blacksmith to forge the crown, and finally use the Water blacksmith to cool down the crown.