[SixOfSpades]

From Chapter 13 of Volothamp's Comeuppance:

• The Unseeing Eye quest should be put off until at least Chapter 3. It is very difficult for a young party, and the Pit of the Faithless contains a small section where you cannot turn back—you have to force your way forward to get out.
• The portal in the playhouse underneath the Five Flagons should also be left until you're in at least Chapter 3. Again, very difficult for a young party. The whole area is no-turning-back: You have to beat the whole quest before you can return to the rest of the game. Also, you can never go there again. And for a final stinger, once the portal appears, you have to go through it, ready or not: If you leave and come back, the portal will have closed, and you will never be able to do that quest. It's safe to go to the playhouse and hear about a quest, but if you go back there after you've completed that quest, it's Portal time.