Replicants as an Antagonist

[salix_catus]

Here's an Idea. Have them start inside artifacts. Somebody touches artifact, activating it, they then get sucked in and replaced with an identical (picked from dead players) replicant version of themselves. This process wouldn't be noticeable to the outside observer, perhaps mimicking other artifacts like the prison artifact? The only way this could work without being abused is if you couldn't tell which artifact did it and it could only be used once.