Peace,
The crypt should be the most dangerous place in Winterfell. Technically (unless it only works on people/animals killed by he or his people), the Night King can probably raise every single body down there. Can you imagine all of the dead Starks rising up and becoming soldiers for him, including a headless Ned?
But the writers probably won’t have the balls to do anything like that.
I think all the dead Starks are encased in tombs. If they awaken they still wouldn't be able to do shit.