When you turn seven, you get an entity to fight. Usually, these entities are aggressive. If defeated, you get a lot of money. If not, it will torment you for the rest of your time or even physically hurt you until it's killed or kills you. This was for population control but to also kill off the entities roaming around. Most make fun of the weak who can not kill/get rid of/tame the entities..

It was a normal day, despite occasional attacks in the town.