Кощей Смертный
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all non-standard heroes have their descriptions written out
How so? Perhaps you meant descriptions (i.e., biographies)? If so, then yes, I didn't come up with them in a single day, and I can't even remember how many times I revised them.
also regarding the set, as I understood from the presence of artifact shops, it can theoretically be assembled
It can even be done practically, but only not by fulfilling the Sphinx's condition)
I still haven't gotten the ring to drop, perhaps it can only be obtained in the pyramid
Exactly right.