The rules are simple
The rules are simple. Every 20 years, all of the realms come together to compete in a fighting tournament. If one realm defeats another one in 10 consecutive tournaments, the winning realm now rules over the losing realm. However, the tournament will continue to be held and if the subjugated realm should defeat the conquering realm the next time, then they are freed. It’s just that simple.
Each realm sends its five best fighters to the tournament. The fighters are chosen by the gods and cannot opt out. If they happen to be killed prior to the tournament, the gods will choose another fighter, and if they happen to be resurrected and chosen by a different realm to compete in zombie form, they still cannot opt out. A fighter can decide at any time that they would rather fight for a different realm and this request is immediately honored. You understand why it’s so important that every realm sends five, and only five, combatants.
The tournament is controlled by the gods. They may not interfere directly in the fighting. However, if a combatant manages to steal a god’s amulet, use it to drain the powers of another god, and then imprint godly powers on themselves to become immortal and thus unbeatable, that’s just gamesmanship. This is how the gods maintain competitive balance and fairness.
Earthrealm has lost to Outworld for the past 9 tournaments. We’ve only got one shot to save ourselves. That one shot is five one-on-one fights, which happen at random times in random locations. The first two fights happen simultaneously, as do the last three. This is important because all five fighters for each side need to be prepared for anything, in particular one guy being in more than one fight if he feels like it. The tournament ends when all of one side’s fighters are down, except if one of them decides to switch sides afterward. That’s why we need to get this right the first time.
It’s called “Mortal Kombat” for a reason: these are fights to the death. Unless you don’t want to kill your opponent. You don’t have to. But if you do, they’re dead and gone forever, banished to the Netherrealm, which is basically like the Christian conception of Hell except that if you want you can manifest a peace garden in your mind and live out your eternal damnation in tranquility and comfort.
Because one thing’s for sure: there’s no coming back from the Netherrealm. Not unless a necromancer performs a quick and effortless spell on you. But beware! You will be an obedient, zombie version of your mortal self, or else the necromancer may decide you can just be the same as you were in life. The stakes couldn’t be any higher.