To start your progress in chaos, you need to access the Chaos Compass located in the Others menu, as shown in the image. Clicking on it will open a window with information about the various relationships that chaos has with other systems.
In this menu, you can see all the related content tabs with which chaos can interact. The main Compass tab will indicate which monsters on each continent are currently affected by chaos. This is used to obtain Chaos Essences, which are used as a kind of currency for the Chaos System.
In the Dungeon and Hunting Ground tabs, you can see how many of each you can do that will reward you with Chaos Essences, as well as unlock higher chaos levels to increase rewards.
In the Tower Arena tab, you can see how many you can do that will reward you with Chaos Essences, as well as how much bonus you will receive depending on the unlocked Chaos Level.
And finally, in the Soul Scroll tab, you can corrupt existing soul scrolls. Corrupted soul scrolls will yield double their original bonuses, while adding a third new and random bonus. Your character will have a limit of 3 corrupted scrolls equipped simultaneously.
Chaos creatures will be present in the designated spawns and content where chaos has influence. You may encounter some creatures with extra indicators near their names, as shown in the image. The chaos level (number shown after the word Chaos) indicates how many times the modifiers are increased for the monster, which are shown in the main menu of the Chaos Compass, in the image above and to the left, meaning for a level 2 Chaos monster, it will have 8% extra health, 8% damage, 10% experience, 10% bonus orb, 6% extra loot, and a 40% chance to have a special modifier.
When killing a chaos monster, you have a chance to receive Chaos Essences, which will count towards the daily limit of the highest accessible continent by the player.
In addition to the extra bonuses that chaos monsters will have, they can also have special modifiers that will alter their behavior in some way. You can tell that a monster has a special modifier by seeing an icon near its name, as shown in the image. The descriptions of the modifiers can be found in the main menu of the Chaos Compass, in the lower right corner by clicking the Modifiers button.
Each chaos level will add a 20% chance for a monster to have a special modifier. When it reaches 100% (starting at chaos level 5), it will always have at least one modifier. Chaos levels beyond that will then have a chance for extra modifiers, for example: a level 7 chaos monster will have a 140% chance to have a special modifier, which translates to a guaranteed modifier and a 40% chance for an additional modifier.
All of this discussed here results in potentially very strong and dangerous monsters, so players should be cautious when facing these special enemies.
When killing a creature, there is a chance that it will generate a Chaos Rift. A Chaos Rift is a place where you will find a separate area from the current spawn you are in, containing the same creature you killed to generate the rift, but all creatures inside have a chaos level of 10. When inside, the rift will have a limit of 1000 creatures killed shared among all players inside. When this limit is reached or the time runs out, the rift will automatically close, expelling all players from inside and giving them rewards according to their kill contribution. Dying will only expel you from the rift and you will lose half of your kill contribution. You can check the active chaos rifts in the chaos compass menu, as mentioned above.
As we have PvP and non-PvP spawns, rifts will also behave differently depending on the type of spawn they appear in. If it appears in a non-PvP spawn, the same rules of the spawn will apply to the rift, meaning there will not be PvP inside the rift either. On the other hand, if a rift appears in a PvP spawn, then PvP will be enabled inside the rift as well. Deaths, however, will not yield frags, and killing another player will give you half of their kill contribution. In PvP chaos rifts, you will also gain 20% additional rewards compared to non-PvP chaos.
The rewards you receive for participating in chaos rifts are a new type of resource used to craft Mysterious Keys and Chaos Dimension Charms.
Chaos Dimensions are arenas where you need to face 3 waves of monsters and a boss. Successfully completing them will reward you with many useful items, such as Equipment Bags, Relic Chests, Single Attribute Reroll Gems, Silver Raid Tokens, and others.
First, you need to find your entrance, each continent having one. It is located in the first spawn of each continent, starting in High Desert.
After finding one, just use the corresponding charm (each continent requires a different one) and you will be able to enter the Chaos Dimension.
In the menu, you can see which modifiers are affecting the Chaos Dimension, as well as which rewards you will be able to obtain and which you will not.
The charms may need to be modified. These modifications will increase the chaos level of the creatures by 5 and add a chaos modifier, up to 3 modifiers. The modifications are obtained through Mysterious Boxes, which are obtained from quest bosses, dailies, and continentals. These boxes require keys to be opened, which can be crafted with chaos resources. When you craft a charm, it will have a random mechanic that will apply to the chaos dimension you participate in, as shown in the image on the right, at the top of the menu.