You could have a different nation of skeletons under a different mortarch, who doesn't follow Nagash religiously like Arkhan but still fights in...
I’m honestly not sure what that is. Unfortunately the feet look human, though - I’m guessing then that that’s the leader for the Warcry faction...
In fact the whole first series is going to be Space Marines unfortunately, but I'm interested to see if they do a Hormagaunt or Termagant for...
To be fair, though, a Grimwrath Berzerker costs the same and he can devastate entire enemy units by himself.
It's showcasing one of the Endless Spells for Forbidden Power (indeed it's heralded as a 'Tale of Forbidden Power') - it's already been revealed...