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After searching for two hours for the missing knight in the catacombs I asked a friend to help me with a tip or something but he ended not only telling me what I actually had to do in a non roundabout way but also what happens after the quest, the fact that there are multiple endings and other stuff.
All this without even remembering the exact location of Anri (''she's near the skellies, right in the back'') so I had to watch a video to see for myself where she actually was and that led me to actually spoil myself about the entire base game.
All that said, it's my fault for not exploring just that one ledge in the whole damn area.