in the sims 2, sims observing a fire will lose hygiene rapidly, and if they catch on fire, all of their needs will begin to drop very quickly, eventually resulting in death. In the sims 2: apartment life, the sims 3: supernatural and the sims 4: realm of magic, evil witches, warlocks and spellcasters will not react to fires that they start. easy my favorite way is to build a room around the sim, let it be a stand alone room away from the house with no doors or just make a room outside and then remove the doors after the sim enters and place a fireplace in the room with a chair and rug touching the fire place turn it on and wait for. Open me hello everyone! what is the best way to start a fire in the sims 4?ways to help the blm movement: # not so.