I have a feeling that my deepest run into
Jupiter Hell is about to end with Freddy Finkle screaming for mercy at the hands of the Summoner. I have no idea if this is the last boss or not, but I finally reached Beyond (aka Hell) and stumbled into the Precipice of Defeat prematurely. A precipice indeed.
I've got 2 rockets for my launcher, 2 krak grenades, 2 gas grenades (no idea if they affect this boss), and 4 EMP grenades (which are almost guaranteed to be useless against a demon boss). Plenty of ammo for my shotgun and .44 rifle, but only 1 medkit to keep me going.
Even with my great perks (my character can never get 1-shotted when above 20 hp, and automatically regens to 35 over time) I don't think Freddy's odds are looking good. Wish me luck... I'm sure I'll be updating this thread momentarily to talk about my glorious defeat

