This is the Pandemonium Mace, part of the Death Knight I created on my patreon. I have made this one free.
The full set of Death Knight miniatures is available on my patreon until the January 31st.
Some of my designs are also sold on MyMiniFactory. Patrons are illegible for huge discounts:
I make unique characters that patrons suggest and vote on. These become available as 3D prints exclusive to patrons!