As a CoS DM, I would absolutely allow it. A magical, quasi-sentient weapon with a strong connection to a person who is not quite dead but also not alive (RAW, Sergei is kinda unclear what he is). And it is located in the Shadowfell. It seems like a perfect fit!
Since it has been in a Dread Domain, I assume that it has absorbed some energy from the Shadowfell. If so, I think it could be used but I'm not sure.
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As a CoS DM, I would absolutely allow it. A magical, quasi-sentient weapon with a strong connection to a person who is not quite dead but also not alive (RAW, Sergei is kinda unclear what he is). And it is located in the Shadowfell. It seems like a perfect fit!
Ah thanks. I was just thinking about it and it seemed to make sense to me, but I wasn't sure.
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