The location of invasion is either announced via broadcast or world chat before the event.

Upon arriving to the area, you will find special mob with rancor force as part of their names. These mobs are typically hard to kill if you are not the same level as them. They drop armour, weapon, pots, arrows, celestial stone, hell stone, heaven stone, reputation waist adorn, and mission scrolls. The lowest level rancor force is level 20.

There are no level 60 and lvl 80 rancor force and if you kill the rancor force boss, it drops a lot of items.

The event last for 30 minutes.