If you refute Lucian’s wishes, you will attack Lucian and Dallis both. You can surrender your source, thereby siding with Lucian and Dallis. You will ultimately be tasked with a choice. Worst yet, Braccus Rex is seemingly under her control. Beyond that, Dallis will reveal that she is actually an Eternal. Once you make your way to the final quest, it will be revealed that Lucian the Divine has been alive this entire time. Choosing the right path is crucial to minimizing the difficulty of the game’s final fight. Once you reach the final quest “End Times,” you will be met with a final choice. Deciding to Sacrifice Your Source or to Attack the Divine Moving forward, there will be spoilers concerning the final quest for Divinity: Original Sin II.
However, you are going to have to use these tactics. Many players have reported frustration with the final battle, claiming that it is too difficult to handle. The final boss fight is certainly no different. Divinity: Original Sin II is challenging to say the least.