how to open Audience with the king AFTER Caer Tarth clear?!

hi guys, title says it all. i cleared the crux of nothingness quest with the green invite..
Did the ritual in Caer tarth with the cloth pieces. now i have a new invitation.

There is no realmgate.. Crus of nothingness cant be clicked or entered..
And there is no way to activate the audience with the king anywhere??

Item Class: Map Fragments
Rarity: Normal
An Audience with the King
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On the edge of existence, he watches with ire.
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Required to reveal the Crux of Nothingness on the Atlas.

How to open it and progress in 0.5.0?