User blog comment:Pauolo/Dishonored 2's Most Wanted List/@comment-6716431-20170221155237

I can now confirm the existence of Synergic Swarm.

This confirmation leads me to a point: currently, we have deduced that the protagonist cannot find the other protagonist's bone charms. I wonder if this is actually incorrect. Instead, perhaps the protagonist can only find the bone charms of powers they have unlocked. I have not found Undying Swarm or Synergic Swarm before this playthrough, and this time I have the Devouring Swarm power. By the same token, it was not until I was doing a playthrough with Possession that I found Mind Runner, Accomodating Host and Agile Will.

There are a great many new bone charms, so much so that it's quite reasonable for the developers to think of a way to prevent the player being flooded with useless bone charms. Restricting their spawning to only those related to the powers the player currently has is a very simple to way to get around this.

It would also explain why it's taken so long to find some of these bone charms, as they only spawn under certain conditions.

However, I can't say this in complete certainty yet. Would everyone else be able to keep a close eye on their powers and bone charms to see if I am correct or not?