Well, some of the answers...
Those potions/drug you have are not for any quests...drink them...see what happens to your stats. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
The warriors guild - i had problems finding it too - the stairway is rather hard to find. It is on the south side of the rock...there is a little path leading to it...more litke the grass is worn out or something...go to the base of it, and look for the stairs (do look hard)
I know that chicken meat, and draven ale restore some mana...
Divine skills, yes you get that towards the end of the game...if you would like more, let me know (i don't want to spoil it..>)
You can get these gems with telekenisis (level 2 or 3 i think)
Hope this helps.
