Here my vision of this beautiful figure, Abaddon means a lot for me, I remember in the early 2000, was one of the most iconic warhammer 40K character, now revisited and probably, he expresses all his power.
I added my personal interpretation on the piece of cloth with part of the "sons of Horus" insegna and the original color, and using the skulls as ritual trophies, adding chaotic runes, just one single rune is real (or I think) should has been written "Odino".