I wonder, since DY wasn't always known by that name, Toland has extensive disturbing knowledge of the darkness and hive magic (like was used in thorn) And nobody knows what happened to him.
It's a Hail Mary, but I'm not sure there is evidence to the contrary.
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I'm pretty sure that Dredgen Yor was killed by the hunter who made TLW... as for Toland, no one knows where or when he is