I just remembered, as you get inside, right there on lowest floor, you should find Detect Thoughts neckage.
Ingredients for new tadpole power are both i think one floor up, or down from that one where you enter (presuming you are entering trough front gate, and not from that garden down there) there is even enough of them for 3 or maybe even 4 of those potions ... i think you can still make only one tho.
At same level as main entrance, if you walk in and go straight to the right ... you open doors and step out on balcony, you find a crate with
If you get to most upper level, you find Bernard. The construct boss, with 3 or 4 animated armors ...
Either you pick corect line and he will give you the ring, or you kill him and get both the ring, and his polearm.
(
Side note > if you have sussur flowers, animated armors cant take actions as long as they are inside their anti-magic field ...)
That polearm is 1d10+1d6Lightning, with incerased range (as all polearms have) ... and by my personal opinion, pretty neat weapon even tho it occasionaly stuns you, that stun only last for the rest of the round ... so basicaly, if you are last in Initiative, there is no consequences at all.
But that is probably a bug.
Now, when you have a ring and get to that teleportation device that get you here, a new button appears that allows you to enter basement > here you find a staff, along with lots and lots of scrolls.
The Grave is on other side of the lake, on place where you find Bulette, abowe Duergar patrol.
If you dig it up (you should be ashamed!
) you find out dog collar with runes, that you (or companions) can wore on their neck.
And finaly, as you explore the tower, and find that part where are beds, and washtub, and stuff ... if you read those papers there, you (among other comands for Bernard) find that Lenore, the cleric that was living here, was so focused on her work, so she rarely even leave.
She had a dog ... wich passed away some time ago (
on the same floor, you can find button close to ground, wich if you push, conjures single piece of meat ... Dog was probably feeding himself 
... also, if Astarion have that colar, as you press the button, he coments that it "pleasantly vibrates") ... so she created Bernard, and even created one voice comand, that tells him that she needs a hug and some comforting, and reasuring that she is loved (this also hints that Lenore was not a human, since Narator tells us that this hug is "slightly low and too tight to be comfortable" ... i believe the only race that feels good is a Dwarf) ... not sure if that happened before, or after Bernard, but that Bulette, that is terorizing us, was also her pet, there can be found a letter telling her that even tho that person who is writing her understand that she miss her dog, Bulette is no pet and she shouldnt risk trying to domesticate one.
This story potentialy takes a dark twist, since in the past, after slay Bulette we could have find magical Medium armor ...
But since that was changed in Barbarian patch, and now there is Bloodguzzler Garb ... Barbarian clothing chest piece ... i hope/believe that Lenore wasnt actually eaten.
