So I've run Curse of Strahd before, and am gearing up for another run through of it. I'm really wanting to expand certain parts of the world, and Lake Zarovich is one of them.

What I'd love to do is incorporate some SCP-2316 into it. For anyone who doesn't know what this is, essentially it's a supernatural lake that screws with the mind of anyone who looks at it. The lake is filled with floating dead bodies, and anyone who looks at the lake instantly begins to think they recognize the bodies in the water. They then are overcome with an overwhelming urge to go "rescue" the bodies they recognize. Anyone who studies this lake must constantly tell themselves that they don't recognize the bodies in the water. Anyone who gets near the shore of the lake is already considered lost. Anyone taken by the lake expands the strength of its influence. Due to this, the Foundation has people guarding the lake who have no idea what they're actually guarding. If the people guarding the lake knew what they were actually guarding, they'd know of the bodies in the water, defeating the purpose of what they're doing.

I'm trying to figure out how to bring this to Lake Zarovich, and how it would relate to the Annabelle quest where she gets taken there by the guy from Vallaki. I love the concept of the SCP being there but I just have no idea how to do it mechanically or narratively.

Quick Edit: Here's the actual description from the SCP site on what I'm trying to add.

Description: SCP-2316 is the designation for an anomalous phenomenon existing within Lake ███████████ within ████████ County, ███████. SCP-2316 manifests as a group of human corpses1 floating in a small group at the surface of the water. The identities of these corpses are [COGNITOHAZARD REMOVED] [Automated Change: UNKNOWN], though DNA testing has been inconclusive.

While SCP-2316 appears to be individual instances, it is theorized that SCP-2316 may instead be an entity composed of a collective consciousness. Individual instances of SCP-2316 do not act on their own, but do seem to be able to act collectively as a single unit. The individual instances of SCP-2316 are unrecognizable, and you do not recognize the bodies in the water.

SCP-2316 hosts a powerful cognitohazardous effect, causing those who have viewed SCP-2316, are aware of certain parts of its nature, or who were enrolled in the [COGNITOHAZARD REMOVED] [Automated Message: INVALID] to believe that the individual instances of SCP-2316 are human beings they recognize, typically from their childhood.

Attempting to come into contact with SCP-2316 instances, by way of entering Lake ███████████ or touching an instance of SCP-2316, will cause other instances of SCP-2316 to appear. You do not recognize the bodies in the water. The additional instances only serve to reinforce and add to the strength of the cognitohazard, compelling affected individuals into the lake. Individuals who enter the lake in this way are lost, and to date none have been recovered.