So the day was finally here. It was the big midsummer festival and the Cassalenters have pulled no stops, hiring our heroes to cater food and drink to the masses. What our heroes didn't know was that the Cassalanters intended to kill 100 people and sacrifice 1 000 000 gold in order to release their children from a contract that would have turned them into monsters. So they show up at the party and make the excuse that they are checking the sound in the rooms for a performance. So they go around and check it all. They don't read the books or such so they don't get the clues, they don't attempt to get through the office of Vittorio so they can't get any keys and even though they find boxes filled with red robes and golden masks they don't know what they will do with them. They find a hidden dress belonging to a noble lady, but don't look for her. They are recognised by a guest whom they don't recall (which they now think is the Black Viper, but is actually a doppelganger from the Yawning Portal). They at least finds the poison Midnight tears and know what they do, they don't connect that the poison is in the lady's chambers and the party has an ending at midnight.
They find the hidden attic, but can't get in since they don't have the keys. So they go back down and through the cellar and finds the hidden vault that leads down to the Temple of Asmodeus. They hear chanting and goes down a staircase and finds the crypt of the Cassalanter. They find the tomb of the former Lord and as they speak with him he gives them a magical armour and mace, which only Parker can carry and use. They also notice the bearded devils standing guard so they go up again and find the balcony overlooking the chamber with 30 praying cultists and a statue of Asmodues carrying the golden skull they are looking for. They get Parker to use Control Water so that the river that runs behind them rises and drowns or sweeps away all the people for 10 minutes so that they can get the skull and then destroy the statue and fire beneath it. They at least left the golden skull replica they fixed in the last session.
And then they goes back to the party not to raise suspicion, says farewell to the hosts, toasts with them and then returns home without a care in the world. They hide the skull in the tower and then goes to sleep. As midnight strikes they awake to horrible pain as the poison course through their veins. In the morning they hear that over 100 people are missing and they suddenly realise that they forgot about the poison and what it was supposed to do. In the evening Vincent Trench arrives and gives them a hint about the whereabouts of the Jade skull. It belongs to Jarleaxle, the drow mercenary leader and the place where they know about drows is in the docks where they stopped the drow assassin. And with that the session ended.
In my mind I had this great tale where they started investigating the Cassalanter mansion and would find this different clues, like the journal hinting them about the search for the treasure and why, breaking into the study and finding the Black Viper maybe giving them hints about the Asmodeus activities and the real truth behind their recent fortunes... and some clues about Jarlaxle hinting them toward the right place without me using Vincent as a crutch. I was gonna tuck their heartstrings about the transformed children and the desperate pleads from the parents, but alas. At least I had to use all my things to create maps in order to cover the temple and the mansion floors.