Translations:Chaos System/7/en
From BlackTalon Wiki
Upon killing a chaos monster, you will then be awarded with a Chaos Essence, which will be taken into account for the daily limit of 200 shared between all continents that you can obtain.
Aside the extra bonuses that chaos monsters will have, they can also have special modifiers which will alter their behavior in some way. You can see that the monster has a special modifier by seeing an icon near its name, like shown in the image. The modifier's descriptions can be found at the Chaos Compass main menu, at the bottom right upon clicking on the Modifiers button.