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Dear BHVR. It is okay if the specific over rules the general.

So your stance with how Killer powers cannot be changed or manipulated visually.

It is okay if the specific, over rules the general. That's how most games work.

So. If you were to change the appearance of The Trapper's traps depending on the realm, that would be okay.

If Trapper's traps were "generally" harder to spot depending on any particular Realm, that would be acceptable.

The add-on "Black Tar" could just "generally" make the traps harder to spot, depending on the trial, and that would be acceptable.

I hope you consider this in any considerations you make regarding how to The Trapper might not be completely garbage on certain maps, Ala Eerie of Crows.