Ok, so I was in the Grottos, and after I defeated the Shrieker, Knights, and Acolytes, I went into the Hive Seeder. It connected to an underground cave. I explored a bit of it, but then came upon something weird. In cave, there were 2 wizards, many Acolytes, and MANY MANY Thralls. I killed them for the fun of it, but quit exploring. Has anyone else seen this?
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Yes, it's not really a secret. There's a DLC mission in there.