Here's an assortment of observations and issues I've had with Sandrah, mostly pertaining to Waterdeep but also a big problem with the Cloakwood sequence. I am using Sandrah v1.08 with hotfixes, so I don't know for sure if any of this has been addressed in the v1.09 release.
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There are several persistent mis-spellings in the Sandrah related material I'd like to point out, so that you can fix them as you go through your dialogue checks...
"toom" - this should be "tome" (referring to "book")
"persue" - this should be "pursue"
"save" - this is used in several cases when contextually it should be "safe"
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Coq (the guy in the super-expensive restaurant) - for some reason he's green-circled. He's not in the party nor controllable, so it doesn't seem to have any game effect, but it's odd.
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Just after leaving the Coq restaurant, a dialogue fires with Sandrah thanking the <charname> for a nice evening, and asking that they go to her [Elminster's] house. Unfortunately this dialogue still happens even if you've already been to their house prior to going to Coq's, as I had...
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The door to Whyrtman's house (which, incidentally, really should be given a map marker once the Umberlee followers tell you about it) still shows the question mark and the "the growling of a large dog prevents you from entering" dialogue popup. I initially thought that this was a bug, but thanks to pure chance I happened to discover that the door IS available to enter...but you have to place the cursor juuuuuust right in order to make the "enter door" icon appear. I'd estimate that about 90% of what would be a typical doorway is obscured by the question mark, leaving a vary narrow chance that a player will see the "enter door" icon.
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Waterdeep needs an inn! As far as I can tell, there's no place to rest while within the city. Besides, a city without any traditional inns just seems...weird. Even Nashkel has one...
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Mystra's Dagger appears to have what I believe to be German-style stats (for example, Damage: 1W4+4, ETW0 Bonus: -4). The text is English, it's just the stats.
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As a player, I still find it greatly annoying to not have a description of what the various Sandrah-related magic items and spells/innates actually do. I'm having to test-save and experiment with the innates, for example, to understand what they are...and in some cases, I still don't really know if I have a grasp on what to expect from some of them. I've found that I've ignored most of her innates that aren't obvious analogs of normal-game spells, simply because I don't know what they are. (On a whim I tried a few of the unknown ones yesterday, just now realizing what "Mystra's Army" does, for one. I still don't know details about what I'm seeing - we need "spell descriptions", please - but the visual effects are very impressive, to say the least.)
As for the items...yeah, I get it that Mystra is all mysterious and all....but c'mon, Sandrah can identify every OTHER item on Faerun, but not her own? It just doesn't make sense.
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I've had major issues with the sequence that starts where Henning is rescued:
-When first entering the final room with Knawlod and Henning, I fought through some orogs but Knawlod was blue-circled and didn't initiate any dialogue until spoken to. However, Henning himself was red-circled as if hostile - my party actually attacked him.
-I initiated dialogue with Knawlod before my group could potentially kill Henning (I think. He didn't die, anyhow. I'm not sure if he could have...)
-After killing Knawlod, Sandrah spoke of the need to take him to Waterdeep for Elminster to heal him. She left the group with Henning.
-We went back up to the entry room for the Cloakwood Dungeon level 2 and found Sandrah had returned, but her dialogue options (when <Charname> spoke to her) were only the standard PID flirts and such. Her "I'm back, Henning will be okay" dialogue did NOT fire until I had a different party member (Minsc in this case) talk to her. She then explained about Henning's ten-day healing time, but still didn't join the party.
-After this dialogue she's still blue-circled and now won't talk to anyone but <charname>, and still only gives PID responses to him. There's apparently no way aside from Ctrl-Q to get her back in the party.
-While blue-circled, I kept seeing "Inventory Full, item dropped on the ground", referring to Sandrah. Turns out these were the scrolls mentioned below, as they didn't stack when appearing in her inventory, and she didn't have enough room for them all.
-While blue-circled, Pelligram is missing. I think this is by design, as she hadn't yet rejoined (Pelligram disappeared when she did.)
-AFTER doing the Ctrl-Q to have Sandrah rejoin, Pelligram reappears but is caught in some sort of weird repeating loop where he runs down the level 2 entry hallway (northeast), then instantly teleports to Sandrah's exact location, displacing her to the side. This happens over and over again.
-After rejoining the party, Sandrah is missing most of the items she had when she left (a few vanilla things did transfer to <charname>). Most notably she's missing her personal items: book, armor, hammer, necklace, belt, and both rings. These are not in anyone else's invetory. These items were not left on the ground in the area where she left, nor in the area where she reappeared. They're simply gone.
-At the same time, Sandrah starts having items appear - or continue to appear, about once every 20 seconds or so - in her inventory; as it turns out these were all scrolls of Cure Serious Wounds that she'd had in a scrollcase or on her person when she left with Henning. The Scrollcase transferred to <Charname> but some of the scrolls within it did not (and yet, some scrolls of differing types did remain in the case.)
-After what I think was all of the scrolls had reappeared, I kept seeing "The party has gained an item" about every 20 seconds, but now with no new items showing up. Sandrah's personal equipment still hadn't reappeared, 20+ minutes after she rejoined via Ctrl-Q. Other equipment she had when this started (some boots, a shield, 3 other weapons she rarely uses, some ammo, a helm, and some gauntlets) did not disappear in the first place.
-Sandrah is stuttering (won't walk properly) after rejoining, until I left Cloakwood level 2.
-I left the area (went back down to the Orc caves) and Pelligram stopped the teleporting stutter, with Sandrah also now walking properly. Her stuff still never came back, though.
I plan to replay this entire sequence later, to see if anything different happens. As things are now, I'll have to resort to NearInfinity/CLUAConsole/Shadowkeeper to get Sandrah's items back before moving on into the rest of the normal Cloakwood storyline.