https://www.youtube.com/watch?v=a2qfColi6yQ
I designed one threshold by 2 piece of Fossil Fragments and 1 Marble Shrub so that the krampus could only enter the furnace but could not escape.
SO. No matter how many krampus come, they will burn in the Forge. Again and again the extinguisher cycle up to put out the flame. As the krampus drops charcoals, then those charcoals burning will burn the next wave of thieves.
Finally I got a krampus sack. Thanks for my pal Xheepey87.
PLS Don't fix any bugs you saw in this video. Thanks to those bugs for that we could find a lot of fun in games.