Dark Altar not able to activate with the Apex

Hi Supporter, please help I couldn't complete the quest as above subject. Stuck and nothing happened on the top floor of the Pyramid

I HAVE THE SAME PROBLEM HELP PLEASE

Hi guys! I apologize for my English.
Need help, do not know how it happened, but I lost from inventory triangular key, which is needed to activate the altar. The terms of reference written activate portal. I was in the band, apparently someone is up to me to activate it, and then all together soaked Baal, but the quest to activate the altar remained with me, and the key is not that kind of nonsense? And then do not go! Tried with a new group, the same thing, nothing. quest to activate the altar is not lost.
  Very sorry, very good build gathered pace (the third time the game already.) This problem did not exist before. The name of my character-maddannik