Hi,Only side quest "Bartender" is still open, but I've freed Najaad (that start & solve another quest).
But to say: when I helped Gula out of his Troll transformation, I put in Gula's Archeological Dig not only the Plate, but also the Queen-troll quest-item there on the right place so Najaad changed from Troll to Goblin BEFORE I give him a Beer !
So I think that was a little bit stupid of me to do it that way

...
The quest will remain "unfinished" as the Queen's Goblet brings about an insatiable thirst; like the King's Plate brought about an endless hunger.
or something like that i think; the quest is kinda bugged that way.
1)In Luxirius Mansion I still can't into a room because of a magical barrier ! Is there a way to go into that room ?
2)And in Luxurius Private Chambers there's also a Locked Chest I can't open with Lockpick, so I need a key, but where is the key ?
1> there's a button near his little hot tub that changes the lighting. press it a few times until a few locations are lit up showing you the location of the buttons- one on a pillar near the hot tub, another in one of the prison cells, and another on the bedside table.
2> that chest only opens if you have Tony's finger. If you let tony go [after killing Taurus], that chest will remain locked.
3) I've still the key of Willy's House, but I can't go back in his house ?? (I know when I was in I hadn't learn Lockpick to L7 via a Trainer, so I couldn't open a locked chest!)
3> whom did you side with? If willie, did he trigger the "house on fire" failsafe and did you leave when the house was on fire? That's probably why... If you sided with the Assassins, the house should still be open.
If you found the Fire Trap button by yourself, and left the house when the house was aflame, that's another possible reason... there was an extinguishing lever in the backroom...
4) What to do with a "Broken Crystal Skull" ? And what to do with 2 Drudanea plants ? Sell them or are they useful for ... ?
The Drudanea, i think, is useless beyond getting into the Orobas Tomb-- so sell it, or stash it...
and i agree with the other guy's logic regarding the cracked Crystal Skull... maybe if you loaded FoV straight-up, it could have been meant as the medium to summon your own creature.
aside from that, it's useless.