lair

pesä A place inhabited by a wild animal, often a cave or a hole in the ground.
puhekieltä A place inhabited by a criminal or criminals, a superhero or a supervillain.
1897, (w), (w) Chapter 21

...Van Helsing stood up and said, "Now, my dear friends, we go forth to our terrible enterprise. Are we all armed, as we were on that night when first we visited our enemy's lair. Armed against ghostly as well as carnal attack?"