I’m brand new to Underworld Ascendant, having just purchased it Friday and running Update 2. Earlier tonight I obtained the heart Abyssal key and it shows in my inventory. I then killed the Animus in the area. While leaving, I chased a mana particle over a cliff and died so I decided to reload from my last save point. Now the quest for finding the Upper Erebus Abyssal Key is still active and incomplete, despite me having the key showing in my inventory and feats in the compendium. I’m not sure what to do next other than to abandon the quest.
Also I have a saved game from after killing the Animus where it is still alive and I don’t have the mana core.