Still some more solo-exploring:
1) Tarackia: Not so succesful - The queen in the hut summoned the blockers too
slowly and my first area hit only one of them. Managed to get another in for
all three (killed one), but they beat the crap out of me before the third
area.

2) Underdark: Better - Managed to locate both keyholders, but as they were
manaresist I will have to come back sometime later with some backups perhaps.

Anyways, few new rooms found and another few points of Holy Warfare and one
more point of Congregation secured.