Chernobog skin concept description of "Demonic Possession"

This skin concept is created by me and only me. I will not release the concept art until it is done!

BACKSTORY:
What describes a demon? You might say that a demon is an evil creature that lives in the depths of hell, and they sometimes rise up from the ground In the mortal world because of human activity. Well you may be correct, but have you heard of a demon possessing a mortal human? In some cases they don't last long, but the rarest of cases is when the demon takes hold of that body and calls it it's own.
Yes, this is exactly what happened to a poor mortal who was at the wrong place at just the right time...
A demonic ritual, above all accounts one of the biggest ritual you could ever lay eyes on, and to look upon it was the biggest mistake that changed the poor humans life, literally. This mortal was captured and held as the epicenter of the ritual.
Once the ritual was complete, a silence echoed throughout the walls, then the worshippers who held the ritual had their souls taken, used as power for their own demon they had just brought upon this land, and that demon took over the mortal body of the man and seized the mortal soul that dwells within it.
This demons power slowly grew as it traveled the land, taking the souls of the innocent. And for every bit of power he gained, the body he possessed slowly took the physical form of the demon, consuming the mortal body. It would use its power to create hellstone from the palms of its hands, as it had the power of hell within the demons soul.
Once its physical form consumed the mortals body, it had enough power to open the gates of hell and reek havoc upon the land. It summoned its minions from the depths to take over the mortal world. And the world would burn, and along with it, the souls of the perished innocents.

The abilities

Crystallized curses:
Stage 1: the possessed mortal hurls a chunk of hellstone(dark red/grey rock with small veins of lava inside) with smaller particles surrounding the stone.
Stage 2: the possessed mortal hurls a chunk of hellstone but the floor below is darker and the hellstone has burst causing the lava to break through and mix with the original particles.
Stage 3: the possessed mortal once again hurls a piece of hellstone but the stone completely shatters, leaving the lava core to be in the middle, while the radius of the ability has particles all around it.
Stage 4: the demon throws a piece of hellstone, but it opens a door to hell(just a pentagram on the floor) and a very large demon hand comes up and once the ability ends, it smashes down bellowing as it disappears with the doorway to hell.
Vicious Barrage:
Stage 1: the possessed mortal throws a sharp piece of hellstone.
Stage 2:Oh well heck, make the hellstone have a darker effect around it, with red light in the middle of the affect.
Stage 3: the possessed mortal throws a literal barrage of pieces of hellstone with lava in the middle.
Stage 4: the demon summons a large demon hand that pierces through the souls of its opponents.(it also makes the first ability explode into a bloody puddle instead of it slamming down onto the ground)
Into darkness
Stage 1: as the possessed mortal retreats, there is only a black aura, even when in a wall it is just a shadow.
Stage 2: when the possessed mortal retreats, an extra dark red aura goes along with the black aura.
Stage 3: when the possessed mortal retreats, fire is added to the aura and once it is in the wall, the middle with have hellstone.
Stage 4: when the demon retreats, it is consumed by fire and once in the wall, a pentagram will signify the center of his own doorway to hell.
Living nightmare:
Stage 1: as the possessed mortal takes to the skies, the shadows of his minions pursue his opponents.
Stage 2: the shadows have a more fierce red aura with flames at their feet.
Stage 3: the demon summons his minions to pursue his enemies but his power is so great that the sky turns into the flames of hell, as he replaces one of his minions, the flames in the sky die down until the ultimate is complete.

how the skin looks:
The skin looks like Achilles knight of the mordred skin but instead of red its blue and he is dressed like some sort of butler, but the clothes are ragged. Once the transformation starts his left arm will turn into a demons arm, tearing through the shoulder of his shirt and his eyes turn into demons eyes and he has sharp nails and he has horns growing on his head. In the third stage the horns grow more, his entire shirt is torn revealing the red demon look and his feet have outgrown his shoes as his feet are now demon feet...yeah that was weird...anyway his face still looks to be human, until the 4th stage where his face looks like the gadget goblin cupid skin but more adult like and his eyes are glowing red. Oh, I never mentioned wings, until now that he is at full power, he has wings.This is his true form.

suggestions?
I want to at least try to have a T5 chernobog skin in the game, and this is what I could think of, I need suggestions as I wanted people to hear my idea. I am terrible at drawing but I will try to draw as best as I can...I just wish I had a PC to digitally draw this.