(The Underworld you can enter, yes, but this place is protected. As are several places down there. I'll make sure to post when you can't or can enter when I introduce a new place, okay? sorry for the outburst. Also, everyone, I have a request, and some sad news to impart.
Friday night, around midnight, seven kids, six who are students at my school, were speeding down a street at 80 mph. They tried to turn a corner, and flipped several times. One student and one friend were killed upon impact. One is now in critical condition. All of those three weren't wearing seat belts. The others in the car were hurt, but are not in any serious condition. I ask that you all, please, take a moment of silence and pray for the families and friends of those young men. I'm sure we all know the pain of loss, and how it makes you feel as if you're alone. Let us give them support, even if it is only spiritual. Please, keep them in your thoughts. Thank you.)
Ferran stood still, wondering at his feelings in this. He hadn't exatly loved his father. The man had been brutal, beating his son whenever possible. He shook his head, deciding to deal with that thought process later. He sighed, and gazed back at Heiji. "So. Now I am king, Heiji. Will you help me?"
Heiji sighed theatrically and stepped back to the edge of the cliff. Looking down, he held his arms out to the sides, and began to speak. His words, in a language unknown even to Ferran, seemed to glide on the wind, whispering voices filling the space on the cliff. Echoes of a language long lost to the world. After a moment, the scenery began to change, forming into the battle that was ensuing in the Living World.
Ferran hissed as he saw the engagements. His hands itched for his blades, and his mind craved the blood of those who would dare attack his love. Turning to Heiji, he growled, his eyes black as night. "Help them, damn it! Cynn is down there!"
Heiji turned solemn eyes to Ferran. "I can help, but not fully. I must let Fate run its course. I can give you this." He held out something to Ferran. It was a ring, a ring Ferran recognised. It had been his father's. On its face was a rune. The Rune of Shadows.

Ferran's eyes widened. "What will this do? I thought it was nothing but a signet ring!"
Heiji smiled. "This will give you the full powers of your Shadow Demon blood. You are only half Shadow Demon, but this will make up for your Wind Demon half."
Ferran nodded as he took the ring, not surprised in the least that this entity knew about his secret. Slipping the ring on, he felt a searing pain as the ring awoke. Dark tendrils slipped under his skin, running throughout his body, through his very veins. That pain was intense, so much so that it brought Ferran to his knees. Heiji simply watched.
After a few agonizing minutes, he stood. He was different now. The ring now shower his family crest and his own crest beside the rune. Other powers had been imparted, something even Heiji had not expected.
Heiji's eyes widened, and then he smirked. "So. You now know what you must do." He kneeled down before Ferran, bowing his head. "Your Majesty."
Ferran's eyes now shone blue, and he smirked. "All right. Where is my armor, my weapons?" He knew he had little time. Time enough, however, to raise an army of Shadow warriors, of his own people. If the King of the Living World wanted a war, he was going to get one.
Haiji smirked, and held up his hands, the whispering words of his spell causing the air to shimmer before his hands. He now held before him an armor.

(yes, with wing included, but its black feathers. Minus the halo though, unless you guys think it fits him)
Dawning the armor, Ferran smiled. He knew this had been just made by Heiji, and he had no clue of the powers it had, if any. Nodding, he raised his sword, and roared, the roar of a true Demon King.
Throughout the Underworld, the word spread. That Prince Ferran Nightrunner had returned, and had claimed the crown as King of the Underworld. The armies, long unused, began training. Soldiers, Generals, and more began to appear, ready for war. They met in Heiji's plane, where they could plan their attacks. All knew there was no fighting this King, but, truthfully, none wanted to. All they wanted was blood.