Yasuke, Warmaster, The Black Dragon, Primarch of the 18th.
After the virus and vortex-bombing of Ullanor in Yasuke's failed retributive strike against the arch-traitor Curze, the only survivor of the Blades of Terra on the planet, Yasuke found himself wandering the warp, speaking with shades of his brothers until he found his way into the webway, and eventually terra.
Fused with his armour, Yasuke crafted a new suit of armour with the aid of Captain Björn of the Eyes of Loki and the adepts of Terra's forges, Yasuke took on the persona of the black dragon, a legend from his homeworld of Cerasus Mons.
Returning to his role as Warmaster, he recalled all those assets of his legion that had spread across the galaxy and set out first to reclaim Fenris from the traitorous Eyes of Loki and his brother's psychic shards. From there, he turned his remaining eye to the galaxy at large in the name of humanity.
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So my Shin Godzilla-coded primarch is essentially finished now! May add to his backpack and/or swap his right hand out, but with the venting steam it's basically a complete kitbash, and I'm super happy with it!