The summoning room
From its decor, there is little doubt that this room had one purpose
and one purpose only; summoning and communicating with demons, devils, and
other creatures from the nether planes. Everything about the room points
to that single conclusion, from the solid steel walls and steel-lined door
to the inlaid pentagram on the floor. The walls are scorched and covered
in soot, as though there had been a great heat in this room; hardly
surprising, given the nature of those most likely to answer the call of
a summoner.

]

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I got flyto'd here by an osprey. It's cursed, underground, indoors, with a closed door. Is this on purpose?

Yes, it is on purpose.