In the harbor pre-battle, if you want a safe way to save the prisoners you can run around to the back door (the guards won't aggro) and teleport each Black Ring prisoner to safety. The magisters will (disappointingly) not react to it at all. You can then initiate the battle without worry of the prisoners dying or getting mass shackled, assuming you want to save them .

Additionally, you can place the massive amounts of oil barrels all throughout the building and harbor and watch the fireworks

I've killed the eternal, looted everything and left. But when I went back to the Paladin checkpoint nothing happened and the quest is stuck. Any ideas or is it bugged?

What's the use of the War-Owl Whistle? The Paladin gives it to you and seems to expect you to use it but apparently you don't?

Will I need The Black Ring Prisoners after the battle? I did the technique of teleporting them out (because I advanced to that section without Source Vampirism, I didn't end up taking the Shriekers on the docks out). After I finish the battle and go to the beach, all three walk straight into the Shriekers. Will they be present later in the story? Don't mind the spoilers, just want to know before advancing on without them.

Has anyone not told or killed the paladins so the news never reach Arx? Does it change anything?

Is it possible to get that added fire damage skill vorrh uses?

Magister Reimond fled at the start of the battle with full health/armor, I guess cause I closed the door to make whoever goes through first waste a turn. Anyone know if he pops up somewhere else or is just gone?

The eternal fight on hard mode is *******, 2 turns and 3 deaths... with guys on 16 level, against 14, good luck on honour mode.

You can sneak in and out cave entrance without fighting Anna