Well, someone did try to enter a blight region recently. They were able to fight the daimons there before being forced to return to the region they came from by the game.
Here is where the Daimons are to my understanding.
Northern Portal Daimon: ? - most likely north of Thalmarkin
E Portal Daimon: Melegra (?)
W Portal Daimon: Watto > Tor
S Portal Daimon: Bolkenia (?)
Midnight East: headed to Baqua
North Blight: Aesh (?)
West Blight: Attacking Dyomoque
South Blight: (?)
Wild speculation: The East & South Portal Daimons meet in the middle and then do a ritual. Bad stuff happens 
. Alternative speculation, the Portal Daimons target population centers and those region get sucked into the netherworld.
If they simply laimed all the regions belonging to netherworld it would be bad enough.
