To enter other dimension you speak with Dimensional Rift Doorman. There are 6 NPCs in the room. Every one of them is enter point of other dimension with different level of mobs 30+, 40+, 50+, 60+, 70+, 75+
In order to enter the Rift every member of your party must have Fragment of dimension. Is possible to trade and give other player fragments. The number of the required fragments depends of the level of inside mobs (for example 60+ mobs need 30 fragments to enter).
The party is teleported to 4 different rooms every 10 minutes. Every room has different mobs. The party leader can change the room one time only. There is chance to be teleported in room with a raid boss.