Yup yup, the bow. There was no error message from the game, it died with the dump report and that was it.
Other items: Preserver, Belt of Balance, Moonstone Essence. Oh and demonologist iirc.
None of which shouldn't have impacted anything, as far as I know.
It was right at the end of a wave, though, last enemy (except the cosmic horror) dead. So it might've been an issue of timing between changing waves and dealing damage to the horror.