Going Away Party

[Leanne]

OK Mark, I'm deliberately paying no attention to previous comments so bear with me if I'm repeating things.

bitter fog mingles with tilted stones -- I really like the idea of fog being bitter, it conjures up ideas of drunken revelry and that delightful aftertaste coupled with the tilted stones, which seems to me the aftermath of a wake -- I did toy with an alternative "fog bitters tilted stones" but that shifts the meaning somewhat -- I think it's "mingles" that slightly decreases the impact of the line as an opener, so maybe "bitter fog twists through tilted stones"?
whose worn inscriptions
chuckle at strangers -- love this!

for within my sarcophagus -- "for" is redundant
tasting petulance,
feral urges loiter -- this implies that the feral urges are tasting petulance, I think your grammar might need addressing. You could maybe try reversing the first two lines of this strophe

summoned to the dance,
I slip into the Stygian -- I love Stygian as a kind of metalepsis, it's the ultimate black
like cool, clean sheets

Very nicely done, Mark, I think the images work brilliantly against the title and with just a few tweaks you'll have yourself a great poem.