Can I play From the Ashes DLC after completing the main quests? Completing the final main game quests does not block access to the content of this expansion pack. To recall, the final part of the campaign begins with the main quest The Die is Cast, namely the moment when Henry enters the Fort Vranik.
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Since this action, the main quest have been completed one by one and you can't take part in any additional activities. After completing the last main quest - An Oath is an Oath - it will be followed by the Epilogue quest. It is no longer necessary to take care of it.
As a result, you may be interested in From the Ashes. If you have met the requirements to unlock From the Ashes, there will be a new quest mark located on the map in Talmberg (check the above screenshot) - it indicates a person, who is Sir Divish. You need to talk to him about plans to rebuild the village of Pribyslawitz. This will unlock the new side quest - Lost in the Woods.
Additional note: You shouldn't play the content of From the Ashes expansion while having a low progress of the main campaign, i.e. Just after you have completed the Baptism of Fire quest. This expansion emphasizes the reconstruction of the village of Pribyslawitz, which is why Henry will have to spend a great deal of money. When you start your adventure with the new content, it's a good idea to have at least 20000 gold pieces in stock, but that's just the beginning of your expenses.