after u enter the unknown regions from RoP, go to the base, its in front of you, then go north, u will find spirit coming out from the ground, go near it and put -enter, then you enter a dungeon, the dungeon boss is doppelganger.
Update:
He is located in IMP2. (You will need a good group) -Stormravenx
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In Imp2
The Rite of Passage is a test of learning in Twilight's Eve and a requirement for most classes to get their 4th and probably final job.
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In order to complete the deja vu quest in Twilight Eve you must be level 199 and above, do the research and development before the quest can be finished. Also you must locate the unknown city that Arnold speaks of.
Rufio is in the second city near free market betwen some trees