Huh, I read about this mission before hand and was expecting it to be very difficult. Reading about it doesn’t really give you a clear picture of what you’re going to encounter, but it does let you know that you only have 6 turns to get everyone out. I had everyone drink speed potions as soon as their turns started. The Duke wasn’t an issue at all. The spiders popped up and exploded, bringing his health down, but the spiders never got a round two. Astarion can attack I think 7 times in one round with speed potion, and I think 11 times if he uses action surge. He hits hard too. So I had Astarion run over and end those spiders. He killed all of them in 1 turn. I suppose a well placed fireball or other AOE could do the trick too. Once the spiders are dead then it’s just a quick dash to the sub and the Duke is safe. The biggest challenge is making sure you don’t get restrained by one of the Naga or whatever those things are. The second biggest is making sure that you send people down each of the correct 3 corridors. Send extra people to the corridor that is flooding since you will have extra NPC enemies pop up there. If you take Wyll and have an earth elemental summoned, you can leave it there and all of the enemies will pound on that thing while you make your way to safety.