My princes campaign came to an end last week. The party had one final portal to close. This was the earth portal. Before reaching it, the party had to face three bulettes along with burrow sharks and stonemelders. The encounter was really tough and took down one or two pcs before the life cleric brought them back up. After a short rest, the party found the armory with the final Mirabar captive, along with some more stonemelders and the mud sorcerer Miraj Vizann. This was also a very tough fight for the group and Miraj ended up escaping behind a wall of stone spell. The dwarf volunteered to lead the party to the earth portal and Marlos. Of course, when they got there, Ogremoch was being summoned.
This final encounter wasn't as tough as I thought it would be for the pcs. They knew to focus fire on Marlos to get the weapon away from him. I had Ogremoch creating earth elementals and gargoyles to harass the group. The paladin was knocked out and the sorcerer was petrified by Marlos. But the Firbolg cleric picked up ironfang, turned invisible, and managed to close the portal on his next turn, taking Ogremoch with it.
The 3 pcs then had to all work together to carry the petrified warlock out (the cleric did not have greater restoration prepared).
In the epilogue of the story, I gave out some of the keeps as rewards. The paladin of Tyr got rivergard keep and group of younger knights of Samular to train. The warlock got feathergale spire and the wizard got sacred stone monastery. The characters leveled up to 11. It took about 28 sessions for the campaign, with each session taking about 6-7 hours.
All of the players then either switched pcs or made adjustments. One of the characters has a more complicated backstory in that he was an eldritch knight from a group that had been TPKed by an adult black dragon. His character in PotA was "brought back"as a warlock by Orcus making a deal with the character's family. That character was now "restored" to his former life but his soul is still owned by Orcus. So at some point the party is going to want to take on Orcus to get the soul back.
In the meantime, a year has passed and the players are enjoying life and are invited to Goldenfields for a celebration and to visit the sacred grove they helped establish by rescuing Teresiel and the Magic seeds. And then the events from SKT took place. So at this point I think I will run the party through some of the events of SKT, and maybe add some stuff from Yawning Portal to challenge them. Then I guess they'll be figuring out how to get to Orcus.