Haven't checked to see if this applies to other Clerics, but Clerics of Talos have an additional dialogue option at the third Wisdom save, allowing a DC 10 instead of a DC 20.
Third book page
Not only Shadowheart as a cleric of Shar gets this additional option for the third page. Other clerics with an evil god, e.g. Talos, also get this option. Shadowheart as a paladin also gets this option.
Tharchiate Codex
After reading the Tharchiate Codex reader of the Necromancy of Thay will receive Danse Macbre after successful completion of a wisdom check.
3 saving throws passed
Trying to read the book of the Thay of course. It took me 56 tries and I was able to pass all three saving throws.Yet It still slammed shut and the quest is still marked uncompleted. I read all three pages. So what did I do wrong?
Also I could not make an account it asks for a rogues name under "more info" for a verification check andt that just pulls up the captcha page. Nothing on it mentions La'zael or any rogues.