I am trying to finish the elite onyx quest. I checked forums how to find him but somehow it doesn't work...

- I equip the shadow minion vanity
- go to red dragons lair
- kill Emma, destroy the black stones around her
- go down that glowing hole
- go through the small dungeon, killing mobs and destroying all black stones
- find another glowing hole at the end
- nothing

There is no possibility to enter...

Am I missing something?