Oh great job on gettting that far. Did you manage to complete the demos kratas side quest for Dracon? As, you can return to atlantis if you did via going to the house with the shop in Athens castle. There is a merlin side quest that gives you some suped up equipment upon your return to the sunken Atlantis. (merlin only available on mac and v2)
The slave quest is available on all versions.
If not don't worry you can continue the main story line by going to the underworld if you remember there is a minion guarding a big door. He is waiting for you to aqquire the scroll which you have now. He will take you to the underworld lake of souls. If you have done the slave sidequests and the draco and merlin side quests the bounty in the lake of souls is indeed bountiful. If not dont worry go there and choose which minion to defeat and rescue the oracle from the lake of souls.
I hope you managed to get as much as possible out of the casino if you havent done the side quests. Additionally, there is a side quest that can boost your exp if you speak to the scribes in the church in a certain order.
Thanks for playing and you should be able to finish it very soon.
Good job oxpuppy635