The door is still closed, thus swarms aren't able to pass through. The Wraith, however, is able to pass through the door to scout ahead.
There's no magic or similar on the door.
Spoiler: Some rolls(1d20+8)[18]
(1d2)[2]
(3d6)[10]
The wraith returns through the door, injured and reports "The security system is fully activated. The chamber within is dangerous."
The wraith took 10 points of damage and has 22 HP remaining.