Health System
Some people prefer the health system. They start with a set of health such a 30 HP, and each 'round' as a set of points they take away. Doing so, they use a dice roller and set it how they please. As an example some set the dice to 10, and happened to roll a 3 within that round. Now their health is at 7, and makes a post corresponding to that. They do so until there is no HP.
Shadow has 30 HP
Rolls a 7 out of 10 against Angel
Angel has 23 HP
Rolls a 5 out of 10 against Shadow
Shadow has 25 HP.

Highest or Lowest Wins.
Continuing the dice, sometimes people prefer the quicker method. They choose a set number, such as 10, and roll to see who is the highest, or lowest to win. It determines by the people which way they desire to go. However once decide a winner, they go by the posts based on that.
Shadow rolls a 5 out of 10.
Angel rolls a 7 out of 10.
They decided highest wins, thus Angel wins the fight.

Free for All
This has no gimmicks or gadgets to abide by. Soley by the peoples discretion how much their character gets hit, and who is to lose.

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Rounds
Posting in rounds means you can only post ONCE every 'round.' This is usually indicated by the first poster, who tends to give a set of rules and a 'due date' to post. This due-date is to represent when everyone should post before a certain amount of time, especially if waiting upon others. Sometimes if everyone does post, they will skip the date. However if someone does not post, they tend to be skipped and the thread begins 'round two.' This is indicated by the same thread-maker, who then gives another date.

This is often the most used of them all, as it is organized. This gives everyone a chance to post regardless of frequency some may post, and gives a moment for everyone to at least either fight, or even speak during meetings. This style is usually used in any type of thread that requires multiple people.

Free-For-All
This type if often the most chaotic of the mixture, and yet can be noted either between very fun, to stressfull. This is when there is no posting order and someone could respond whenever they want, and in this way those who are more active and want to participate more, may not be hung dry by waiting upon others. In this case though, those who do not have free time tend to be lucked out and left behind.

Free-For-All Rounds
A mixture of the two above. While there is no set order to do, there is a certain criteria that is still asked to follow. In most cases whoever is setting the rules, may ask people not to post at least until 2-4 other people have responded in the same thread. Sometimes may bypass if a few days have passed, for they do not want to continue a stall. In these threads instead of a due date of a 'round,' there could be a due-date when the thread will start to conclude, or where they hope to be. Within this type it can't truly be said they know when it will end, and either can be shorter, or longer.

The Vivarium has a dice system that is a completely optional tool to use to enhance your roleplaying. Some people use it to determine the outcome of a fight, or others may use it to enhance a scenario like whether a hunt fails or succeeds. The option is always available and on discord as well for free use for anyone. Note however, once you post it, it cannot be edited and you cannot view your role in the preview. This is to prevent any cheating.