Trader can trade common drops from the dungeon for items that summon Halloween raids. And drops from Halloween raids for a Halloween workbench. Truly, she is a very nice trader that gives us very good prices.Halloween raid? I have ot look into how to summo nthem.
And health potions? Never used them. Didn't even know they exist. Apparently I haven't unlocked them.
Health potions can be crafted on the cooking table, and they restore 50% of your hitpoints when used. I usually keep a stock of 10 when I go on an adventure. If you don't have all the ingredients yet, you can just chew on raw herbs, that restore 10 hitpoints per use.