C1841 One against two

Demon energy rose in the air above the swamp, a large amount of it gushing in through the cracks. After infecting the swamp 'sea of origin, it formed a space similar to the Infernal domain in the sky above the swamp.

Although Black Nightmare's possession was advanced, it shouldn't be this fast. However, don't forget that outside of the spatial crack in the Source Swamp