We'll split the raid into two groups of soakers in order to handle a simple stack/soak attack throughout the fight--it's identical to the soak attack used by the first sanguine depths boss.
There's an add that drops puddles that needs to be focused down.
At 0% mana, dausegne will channel at one of the podiums at skull, if we can burn her damage shield down she takes even more damage.
Throughout the fight, rings will spread out from one of the podiums at skull, which do a small amount of damage but apply a debuff that makes additional rings basically kill you. It starts with one ring, then two back to back, then three, then the boss is dead. We either preposition boss in such a way this isn't an issue, adjust and run from the ring until our debuffs are gone, or we immune/blink over it.