*Thud!*
The Necromancer rolls along the ground but is stopped when his flesh golem picks him up with a rotten hand. "YOU WILL STOP NOW BOY!" he roars, throwing his arms out as his eyes shine brightly.
Hundreds or maybe even thousands of undead run into the room from various entrances, all gathering around the Necromancer as he floats a few feet off of the floor with his staff in hand. "RELEASE MY MAGIC NOW!"
Unfortunately for the Necromancer, Harry wasn't in any state to under or even hear his demands. The young boy's eyes roll back into his head as green and blue lightning crackles erratically off of his body, scorching the air around him and anyone who might dare to approach him, along with Harry himself, even with his wounds continually healing the damage it was completely physically and mentally exhausting to continually experience it.
The Necromancer wasn't even able to do anything to Harry anymore, as the pool of blood that he was using as a substitute for his magical core had been completely dominated. Any undead that entered it would melt or possibly turn to Harry's control, and the consequences should the blood touch himself would be too catastrophic to even consider.
The fact that Harry could subsume the pool of blood in the first place was unthinkable. The Necromancer had long confirmed this after many centuries of gathering knowledge. Such magic simply didn't exist in this world!
Harry's pupils roll back down so that they are visible again, but he hadn't nearly regained control of himself. Blood trails down from his tear ducts as he levitates from the pool of blood, blood snakes still connected to his wrists and hungrily sucking up blood into his body. "DIE!" he screams, swiping his arm haphazardly and causing a huge wave of telekinetic power to sweep over the room.
The wave of force utterly destroys many of the weaker undead gathered, while also throwing the more durable survivors across the room and into nearby walls and pillars. The Necromancer had barely shielded himself with a sphere of ice, understanding that any magical ward he conjured wouldn't protect him against what was still technically his own magic, that Harry had taken control of.
"FOUL WRETCH! I WILL FLAY YOU AND YOUR PET BEFORE YOUR EYES! I WILL DEVOUR YOUR SOUL, SHATTER IT AND MAKE YOU WATCH AS I DESTROY THIS WORLD!" the Necromancer angrily shouts as his ice defences are broken away like paper in a sand storm.
He smashes the butt of his staff onto the ground before him and unleashes his own magic, causing both the room and the rest of the Palace to begin rumbling. Massive shards of ice drop from the cracking ceiling towards Harry, but he just telekinetically grabs them from the air and throws them at the Necromancer like rocks from a catapult.
*CRASH!CRASH!CRASH!*
The Necromancer responds by summoning huge arms made of bone from the ground that block the shards with relative ease. Afterwards, they shoot forwards and try to snatch Harry from the air, attempting to tear him away from the pool of blood, along with his connection to the magical source.
Harry just raises his hand towards the arm, however, closing it and stripping the Necromancer's control from them like a spider from its web. They stop mid-strike, stilling momentarily before turning on their original master, fists bared.
*KUUUUUSH!*
The Necromancer hastily takes control of one of them again, forcing it to grapple with the other arm while summoning six glowing blue orbs above him, all of which immediately shoot towards Harry. "THIS IS MY DOMAIN! YOU WILL NOT SURPASS ME HERE! YOU MAY HOLD MY MAGIC, BUT THAT IS ALL!"
Harry again tries to dominate the glowing orbs, but is taken off guard by the sheer density of the magic composing them, being unable to halt them as they shoot toward him. He hastily telekinetically shifts himself in order to dodge them but is unable to avoid them all as one shoots through the side of his chest, causing all it contacts to quickly decay and rot.
"HAAARGH!" Harry screams out as his overcharged regeneration struggles to heal the decaying wound.
The orbs turn direction in mid-air as the Necromancer twirls his fingers, forcing them all back towards Harry for another strike. Harry continues dodging th orbs while throwing out more spells towards the Lich, who responds in kind, sending spells of his own while manipulating the orbs.
The orbs nearly hit Harry again, only for him to tug at the pool of blood's magic, causing another shockwave of magic to explode outwards, causing both the orbs to fade from existence, and the giant skeletal arms to drop lifelessly, all magic leaving them.
The lights in the Necromancer's eye sockets flicker as the wave passes him, almost causing him to fall out of the air had he not quickly corrected himself. A growl leaves his skull as he tries to strip Harry's control over his magic, but it's to no avail as all his attempts prove futile.
The struggle turns from an external physical one, to an internal mental one, as both Harry and the Lich begin tearing at each other's mental defences... In all honesty, in a regular situation Harry would have been rendered braindead the instant the Lich attempted this, but now that he had the voices and minds of tens of thousand of the Lich's victims trying to take control of him, both were unable to do any meaningful harm to one another.
"ENOUGH!" Harry roars, both physically and internally as he wrenches control of his magic and body from the overpowering emotions and spirits attempting to possess him.
He had to end this conflict quickly and disconnect himself from the pool before he lost his mind. Even now he could feel his sanity fraying at the seams as every one of his brain cells was being fought over for control.
He was unable to force his regular magic to do what he wished, so instead of thrashing around haphazardly like he'd unconsciously done earlier, he pulled on the one source he hadn't touched in many months. His demonic magic.