Greed
The battles were intense, it was not like anything he had ever experienced, not like the friendly spars he had been in. There were body parts everywhere, craters and fire had destroyed that part of the forest. Different power levels engaged in combat in various parts of the battlefield, on the land, and in the air. He was fighting a war demon of demon Lord prowess, and he was losing, badly. War demons are physically oriented demons, they have a tyrannical physique and a weapon that needs immense strength to wield. It was a bad combination for him since he could only make use of the laws of life. Demons, in general, are the complete opposite to them, especially ones that are capable of freely using abyssal flames, because High elves are more Intune with nature which is weak to fire. So he was losing, he had used everything in his arsenal, he transformed into various animals, the demon would just destroy his spells with its four hammers and shrug off spells it couldn't destroy with its body. Only his king Domain could slow the demon lord enough for him to dodge and roll in unsightly manners, or else he would be crushed. His opponent seemed to have unlimited stamina, and he was dealing meager damage to the tough-skinned demon. As time passed his frail mind reached its limit and he slipped. Then he was hit in the chest by the huge hammer and was thrown quite a distance away. The pain from being impacted in the chest by a hammer weighing 10 thousand tonnes was too much for him to bear, so he refused to move his body after that and just lay there.
The soul fragment of a dead demon Lord mistook the intense bleeding, fractured and mangled body as a sign that he was dying and tried to possess his body only to find out that he wasn't. Gehald was just sick of it and wanted to sleep, so he decided to play dead, but even that wouldn't come easy because his soul was suddenly impacted by a terrifying pain. Even though he was inexperienced and young, the possession failed, because he was a King through his own efforts, not through fusion with a King crystal. It wasn't until later that he learned that it was the height of foolishness to try and play dead to a demon, he would have to pay for that mistake with his true death if he hadn't been saved by another High elf.
The possession failed and he got off that event with just memories from that demon lord and some injury to his soul. The memories were from a demon of greed, and it changed his outlook on life. From the memories, he gained the knowledge that the demon attacks were a result of tacit acknowledgment with the realm lord. Because the realm lord could have locked out any trespassers but he allowed the demons to mount attacks on the plane. The elves got some battle experience and the demon lords get life essence. He also gained an obsession for power, either from the memories or a side effect of the possession, he doesn't care.
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From the demon Lord's memories, he learned some of his flaws in combat and the various efficient means to correct them. He promised himself to do better and he did just that. As the invasion continued, he became better and better at fighting. The bloody battles honed his fighting sense. He continued to be diligent even after the war, he now looked down on other elves that were busy having fun. He didn't notice the changes in his personality and his sudden drive.
This obsession changed his outlook on life. He became greedy for power, to others he became hardworking in his training and nothing else. Soon he became a sovereign in the law of life and gained the power of a king in the laws of the earth, water, and air just after 5 origin cycles, a worthy achievement, but it wasn't enough.
During the long period after the war, he had gone out of the High life plane to train and had met various extraordinaries and seen different types of races. He became aware of the various advantages that some races have towards training and progress in the path of perfection. For example, High elves have a high magic affinity, Dragons have a very powerful origin core that pushes them towards perfection even with little effort, vampires grow stronger as they age and drink more blood. Some really strong vampires even feed on the soul which greatly increases their power. Then there are minotaurs, hydras, krakens, phoenixes, and other divine races. These races have powerful inherent abilities and aptitudes for magic, but they also come with weaknesses. Dragons for all their ease with magic manipulation can't master opposite laws of their origin core, water Dragons can't master the law of fire and vice versa, plant Dragons can't master poisons, Dragons of destruction can't master creation laws. They were also too slow in training, these various reasons made their race lose out on holding the sit of realm lord. Compared to all these creatures High elves seem lacking, they don't have powerful race abilities, even with their magic affinity it is still difficult to master the law of fire.
He made a decision some years after that, he decided he wanted all these abilities. He wanted the powers and not the weaknesses. To make that happen he started making plans and executing some. He planned for almost an Origin cycle and soon he would succeed. He just had to succeed during this upcoming trial of heaven because there is something very important he had to get from the tower. It wasn't going to be easy because what he is looking to get is something most, if not all sovereigns want to get their hands on.
He couldn't help feeling excited as soon as he saw the tower from afar. He tapped down his urge to get there faster, the event won't be starting soon.