how to enter the dimension rift and what do I need for it?

the dimension rift is a timed .........thing rb i shall call it beacause there is an rb in the end of it.To enter you need fragments of dimension which you get from yoke of the past quest at each catacomb by the dimension keeper.....to get u kill the nessecarry mobs and be sure to have much.....To enter just talk to the dimension keeper and say i want to join the fight......Select a rift of your levels and gather a full party like if it was a raid boss party and fight the mobs fast because u got only 40 minutes to finish it and no more carefull not to be disconnected beacause you will not be able to join your party again.There is a high drop ratte of nice items in it and its worth entering.....

well I never was there so how many fragments do I need for example per minute?

u need the fragments only with the gks of rift , btw there isnt only 1 rb in rift , there is anakazel , lilith , nephilim ,...

nbr of dimensional fragments you need to enter depends of the level of the rift you want
and anakazel gives different things at different level

Hero rift (76+ mobs) needs 36 dimensional fragment per party members
Commander (66+) need 33
and it decrease by 3 for each level range

anakazel is x8 level (in commander he is 68, in hero, 78 )

in hero rift, anakazel can up a soul crystal to lvl 13 while in commander rift, he drops books of giants and life crystals (in lower rift, he drops full weapon, sometimes)

you need to be at least 2 to enter the rift but, a little trick, you can be 2 in party, one in shop in town and you entering alone in the rift but both needs dimension fragments.
Only party members who are near the npc are porting in the rift BUT if one of your party member leave the party, all the party is kicked out of the session.
Same if you change your party leader.

Rifts mobs are able to use soulshots when hitting you, archers are very ubber in rift but don't move, you need a really good magic protection in some room and one mob make an AoE explosion when he is hit (name of the mob is always martyr something)
You can "use a chance card" once per session wich permits to switch to another room
you stay in a room 15 minutes and the rift runs for 40 min, you can also "give up" wich put your party out
If you soe in rift session, you return to the rift waiting room, same if you die and click nearest village.

You can also access to the rift trought festival of darkness, speak to any npc in festival, last option is to be teleported into the rift.