Inside of the tavern in Stillsnow is an Ingenious Inventor, who is working on a portable heat source. However, he is missing a few key components to make a functional prototype, particularly some coal, flax and a handy metal container. Luckily for you, all three items can be gotten from NPCs in Stillsnow by using Purchase or Steal. Head to the entrance of the village and the villager there will have Adequate Flax. There is a NPC hiding behind a snowman in the southern half of the town, so hunt him down to find a Portable Pot. For the coal, head to the northwestern exit, where you’ll find a NPC with some Satisfactory Coal. Bring all three items back to the inventor to finish.