I have a similar problem, although I HAVE destroyed the huge Bloodstone surrounded by Void Demons, and stopped the fireball attack, I STILL cannot open any additional portals in the Homestead.
I have 14 Inert Stones now, I killed Cassandra, I have 3(of 4) Elemental Portals Open, but the "Forbidden Portal and One other are still closed, and Zixzax, Icara etc. just tell me to go get more stones.
The last 4 Bloodstones I used didn't open any other portals in the Homestead, and I used them AFTER I stopped the fireball attack.
My guys are all Level 21, end game gear, everything is defeated that can be defeated, yet I am now out of Stones, and the Source Temple Door will not open.
Bugged? Doors basically stopped opening in the Homestead after I got the third elemental portal open.
