So 2 of my friends started to actively play recently and encountered a bug during "the Sacrifice". They have to claim Excalibur Umbra from the foundry, but when they try they get a "Unknown Error" popup and nothing happens. They cant progress the quest now. And we havent found a fix for it through old forum entries as of yet. I dont know if it really has something to do with the last hotfix but it seems like thats where it started. I saw multiple players ask in chat about it because they are in the same situation.