Aww yiss, now that's some update I've liked to see
Great stuff as usual, Mioum! I really love the conversion work on Arkhan - that ruined pillar is really better than those spirit hosts and wings are a wonderful idea! From where did you get such wings? The morghasts [I had to check the name, I can't remember those new snazzy names] are also great, especially the gold parts. And the little dots on the Arkhan's mount bones - I don't know if they are there on the model, but they look sweet. I'm only not so sure of the use of blue on the etheral things, I'd personally go for something a little more green, as to not add too many colours into the mix.
Nevertheless, it's still a top notch work and I am waiting for Neferata and Mannfred
And also an occasion for a little rant

seriously, GW? Giving the morghasts such big strong legs and then contriving the thing with the wings and fiddly spirits? It's probably only so they would break and people would need to buy more

they don't even fly properly in the fluff! Nice idea with the 'invisible' sticks, but there's still a mistake in the design on the GW's part in my opinion