So, just beat the game, and figured it was worth noting a bit of a hiccup in the design of it. So we decided it sounded more fun to become divine, in case it gave us a final fight against more voidwoken or something. It put us in the arena, 1v1, we were both lone wolfs, and he killed me. He had uncanny evasion and I forgot that let him dodge hail storm. He won, chose to sacrifice his source, and we got sent to the lady vengeance for the final talk with the characters and the epilogue. While on the ship, I decided to get playful revenge, ate some source orbs, and hail stormed him.
This killed him, and then the issue happened. Apparently the game was still checking to see if one of us would kill each other, so it teleported us back to the crypt, and gave me the option of becoming the new divine and sacrificing my source. This allowed us to get both the Supreme Sacrifice and Risen achievements.
This is more of a silly note than anything, but it was worth noting that it didn't seem to work as intended.
Also, side note, the final fight was easy as heck on classic with two lone wolves.
