Black Desert - Giant Bosses And Warships From The Latest Datamined Images
Some of them were seen in the actual game, but not many people survived the encounter to tell the story.
Balrog Epic Boss (a giant creature that was imprisoned for the last centuries). This looks like Baium from Lineage 2.
This Epic Boss appeared in one of the official Trailers (at 3:00) and a smaller version was seen at the end of the second video.