To enter the Dimensional Rift, you need 1 dimensional crystal. You get 3 dimensional crystals from your daily quest and you can stack up to a maximum of 10. You get a choice of either normal or hard. Entering either one will consume 1 dimensional crystal. You can bring up to 5 monsters. This is ideal if you want to train your fodders and you have a very strong monster that can carry the other 4. It is also good if you want to use up all your energy and you do not have time to train in Faimon/Tamor/Hydeni/Aiden maps. It is a quick way to burn energy if you have very little time to play. Double experience boost works in this map. Here is a breakdown of the experience and mana you get from normal and hard mode courtesy of wikia.
|Difficulty||Total||Per Monster||Total Mana|
|Normal||22,330 (1116/e)||4,466 x5 (223/e)||12k-15k (~750/e)|
|Hard||40,525 (1350/e)||8,105 x5 (270/e)||22k-27k (~850/e)|