Sorry to revive this old threat, but I thought why open a new one, if one already exists.
The final fight against Selaad and Baresh might be slightly bugged in the most up to date version of Sword Coast Stratagems. At least it shows some weird behavior. According to the description: "Selaad and Baresh are now both greater werewolves, as well as being respectable opponents in human form - Baresh is a twelfth-level fighter, Selaad is a tenth-level mage. Only once reduced to below 25% hit points will they take on their wolfman forms." The fighter and mage part is working. Baresh hits hard and Selaad does his mage thing and summons Ogres. Here is where it gets weird: Baresh just dies at one point, pretty much around the 25% hit points mark. He explodes but does NOT turn into a greater werewolf. He is just gone. No EXP are awarded, nothing. Just gone. Selaad on the other hand turns correctly in this respect. Thing is: Once turned werewolf he is completely immune to any weapon (or shall we say any weapon I got available). The Sword of Balduran and Werebane (the dagger) both do no damage, Selaad is immune to their damage. Regular (magic) weapons do not damage him either. Only option is to ctrl+y the fight I guess (which works fortunately). The fight with Karoug worked as it should though.
As I reinstalled between the Karoug and the Selaad fight (reinstalled windows on a new ssd and the old install was trashed due to steam downloading something), I went back to a safe before the last talk/fight with Kaishas and fought her. Everything there worked correctly though. Kaishas is immune to all weapons but Werebane and The Sword of Balduran. I did not yet obtain the Shapeshifter-Bastard-Sword (or Ajantis has it, who I did not bring along), so I did not test that one. Maybe something someone should look into. No game breaking bug, as you can just ctrl+y, but nevertheless broken.