The beetle is Carabus nemoralis, this observation is for the parasitic fungus, growing out of it. The last picture is how it was found, the others are one month after, with spores appearing. kep it in a moist jar.
parasitizing Cyclocosmia truncata.
See spider observation here:
https://www.inaturalist.org/observations/173218441
This is just a guess at this stage. Please let me know if you have a better idea here! :)