Quest Ascent Power

Hello,

I have a problem with the quest Ascent Power.
Unfortunately the quest cannot be completed. The quest always sends me to Traitor's Passage, but once I get there I have to go back to contact NPC Zarka.
Unfortunately, this doesn't tell me and the quest that I want to go back to Traitor's Passage.
I can imagine that I once lost a quest item but can't do anything anymore.

Please help.

translated with Google