Ok I'm at going crazy here when first entering the basemant the nightkin would appear to attack,well I died and now they remain invisable with no possible way to kill them. Am I missing something or am I stuck in a glitch?

You cannot use VATS to kill them when they are cloaked. I suggest grabbing one of their clubs and just smacking each one to death.

Or just shoot them once and they will become uncloaked and you can use VATS.

Just figured it out the are suppose to appear when them attack... it was a glitch, restarted game and its back to normal.

Strange.. They rarely uncloak for me, I guess mine is glitched, too.

Oh well, I like the extra challenge

Yea it repeats, ever time you die it forces same glitch reset and good again

I packed quite a bit of dynamite when I went down thee. My shotgun helped too.

They rarely uncloaked for me to. I beat em all down with there own rebar club. I am still lugging a nice rebar club around for when I dont want to waste ammo.