I wish the DLC to go more in-depth around the concept of The Deep that was introduced but never truly explained. Aldrich and Sulyvahn dreamt about the Age of The Deep Sea, which makes it a really interesting part of the lore to explore.
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Some people think it could possibly be a reference to an upcoming game by from soft, but I don't know I'd rather have that be a DLC too. I mean, it convinced Aldrich to devour gods for Christ sake.