So, you had the 2nd pyramid somewhere already, right? the one you thought you had lost.
Intelligence potion in Mushroom Forest/lich Cave seems not to be a permanent one.
Resetting hardocre => this is strange, because, if you use "hardcore" you can't reverse. Did you "apply" the change?
Crystal bag => do you have items reducing your air resistance?
Plants => I found them everywhere in Act 2 => the alchemist garden e.g. or in the Water Lava cave - in barrels, IIRC, even the BF monsters drop it
Mushroom extract/spider web => creating the antidote, giving it to the imps so they heal is buggy. As soon as you move the antidote in your inventory afterwards => quest shows up again. But you got the XP.
keys => did you find keys in the BF? They're useless. As you change the act - you still keep these keys. So, I advise dropping keys as soon as you change the act.
Sigarr => I would like to have a save from you. Please zip/rar it and send it to
kiya1@t-online.deI'd like to see the Crystal Bag thingie and the pyramids, amongst other things, "hardcore".