The wand is just a fun little quest, if you still have the map from the fountain of wisdom you may know where to look
Stone mushrooms do crumble to dust in order to 'spore' and I beleive if you leave it for a while longer you will get a new mushroom. That odd behaviour and movement is actually a trick to complete a puzzle muuuuuch later
Snapdragons have a couple of uses. One of the best ones, though, is eating them for cool temp stats. Note planting a snapdragon or seeds in the right place can give you more snapdragons later. Just like spitter berries. Spitter berriesd are food, and you can also plant then, grow spitter trees, then kill those trees for more berries. I forget if they have medicinal uses beyond that.
The kitchen area is right beside the door to the wine celler, and is close to the tapesteried area that had the stairwell up to the minotaur.
A turquiose key and not an emeral one? Very important! Keep it for later, and don't store it on the floor, store it in an alcove. Noooooo reason
Unique items have text in the description, though maybe you need a good priest to look at them (or another high level character). Normal thorns are just thee equivalent of poison darts otherwise. Though be wary of assumig any item is ordinary. Some are special for good or bad reasons, yet look innocous or like all the others. Sometimes even a stick...
When you got the kath vinegar, did you open a lot of nice bonus areas? If not, go back there and solve the whole area. I beleive you should be able to get one of most if not all of the guild items there.
Rememberthe touch the eye of your character to see their stats - this should tell you if a character can't advance further without a guild be opened up more.
If I were you I'd go back to the supply area and try and open any of the doors? There should be one gando gives you a hint at...if you've found a few more guild items, you might be able to go that way.
Otherwis,e I warned you against the temple, but it is something you can at least try. If you foudn the cross key, and navigated the area beyond, you can find the easiest entrance to the temple. Beware the guardians before it (run away fro mthem), and we wary of the four stairwell room they are in - two stairs go to the temple, one back to the cellar, and the last goes to a nice area with bonus stuff, but one that's hard to finish if you can't kill immaterial beings.