On some these guys I did over a hundred "kills". Some of them I just briefly checked to see if they would drop anything outside the scope of the "Floor Level" drop like Silver Sword or Dagger. The way the game seems to work with drops is that it is determined at some point after the end of the battle. So to test make a save point right when you kill the enemy. Then on random points on the final prompt that pops up gold/exp, or rank up message you press confirm. Much faster than trying to just keep track as I play. That method is valid for any enemy. Just save, press confirm on prompt, see if you got an item, then reload, repeat.
So far my conclusion seems to be that the rewards are floor based, not enemy based. Which sounds like good news since even scrub enemies could give you great drops on that floor. Although some enemies seemed to be more willing to give the better rewards like Snakes or Super Zombies. That's my theory ATM anyway.
Also seems that if you have no empty space on the guy that dealt the finishing blow you get no drop. So yea there's that.
Later on if I play the later floors I will continue the list, but please add to this thread.
-Floor 4 Spider Death Dagger ( Very Rare - Only got a SINGLE one for hundreds of reloads across the floor) Red Staff (Rare) Helmet Chain Long Sword Silver Helm Wizards Wand Great Sword Great Axe Silver Sword (Rare)
-Floor 4 Snake Chain Helmet Silver Sword Red Staff Death Dagger Scale
-Floor 4 Goblin Red Staff Wizards Wand Silver Sword Silver Helm
-Floor 4 Super Zombie Chain Great Sword Silver Helm Scale Silver Sword Red Staff Great Sword Long Sword
-Floor 4 Weak Zombie Silver Helm Helmet
Floor 3 Soldier Staff Leather Sword Scale Long Sword Wizards Wand Shield Great Axe Jewel Axe Great Sword
-Floor 3 Ghost Wizards Wand
-Floor 3 Goblin Halberd
-Floor 3 Bat Scale Great Sword
-Floor 3 Magician Helmet Broadsword Long Sword Great Sword Staff Jewel Great Axe
-Floor 2 Soldier Dagger Helmet Long Sword Sword Scale
-Floor 2 Spider Long Sword Jewel
-Floor 2 Goblin Scale Great Axe Wizards Wand
-Floor 2 White Zombie Scale Axe Staff
-Floor 2 Bat Great Axe
Your findings pretty much line up with this guide over on GameFAQs. https://gamefaqs.gamespot.com/nes/587676-swords-and-serpents/faqs/21153
The one difference being the Red Staff on floor 4, which they have listed as treasure class D, which shouldn't be available until floor 6. Entirely possible that they either put Red Staff in the wrong group, or if it really is rare they just never saw it there.
Fun fact about that stupid %^#$ death dagger, I got it in a run right BEFORE my RPGLB run x..x I cursed at the game repeatedly
Ok so it was not just me. I saw it once on of my PBs on the Floor 5 from a spider, and again when testing on a spider on Floor 4. Seems to be quite rare. No known way of manipulating drops I guess?
Not that I'm aware of, though I don't think it would be as much "fun" trying to manip the entire run out
From what I can tell, the RNG is frame based, at least when concerning combat rolls (To-Hit, Damage, Evasion).
It probably functions like that everywhere, if I had to guess.
