These concepts were created for the Frostivus 2017 Call to Arms, for the Dota 2 Workshop. Base character models were created by Valve.
The Scourge of Winter - Wraith King (modeled and textured by Manuel Virks)
http://steamcommunity.com/workshop/filedetails/?id=1210325510
"Icewrack Marauder" - Troll Warlord (modeled and textured by Christian Gramnaes)
http://steamcommunity.com/sharedfiles/filedetails/?id=1208430559
Frostivus - Axe (modeled and textured by Joe Pikop)
http://steamcommunity.com/workshop/filedetails/?id=1210663979