Thank you for the incredibly kind feedback; it is wonderful to read!
I am thrilled you enjoyed the writing and the overall Appendix N feel. Please feel free to steal the Geometric Wraith for your Vaults of Vaarn game. I would be honoured to see it stalking amongst the shadows.
I included the clock mechanic to create a pressure pot of tension that builds directly from the players' actions within the Ossuary. I am glad you found it a useful tool for driving the action forward. Thank you again for your thoughtful comment!