The apples don't seem to stack. Cursed Shield + Ring of Courage doesn't work, even with 0 shield (seems to trigger on HP loss). These Rings do stack, though. The Dragon Wings seem to check for lack of armor before the battle, not after (may be intended).
The lizardman could use a couple of Rings of Protection instead of just armor, but I guess it's hard difficulty and still winnable.
Can confirm about apples and the Cursed Shield + Ring of Courage thing (which I assume should work or else the Cursed Shield is straight up impossible). Hmmm... not sure about the Dragon Wings, was this fixed? and the Lizardman is hard indeed, really prone to bad runs... also I get so much gold with him despite it now being useless but very few shields, even with a couple of rusty shields it doesn't help :(
