Description:

Vaelarath, the corrupted golden dragonborn mage, was a striking figure. His scales were a dark golden hue, and his eyes were a piercing red. He was tall and lean, with sharp features and a cruel, almost malicious expression. He wielded a crystal-topped staff that was formed from the tusks and claws of dangerous beasts, a symbol of his power and the source of his corrupted magic. He was adorned in dark robes, embroidered with magical symbols, and he had a unsettling aura around him.

Personality:

Vaelarath was ambitious, power-hungry, and had no qualms about using any means necessary to achieve his goals. He was a master of dark magic, and his thirst for power led him to be tempted by the entity attempting to invade the plane of existence. He was a manipulator, who used his knowledge and his charm to influence those around him, and he had no regard for the well-being of others. He was also a deceiver, who hid his true intentions behind a mask of loyalty and friendship, and he was willing to betray anyone to further his own goals. He was a dangerous individual who was willing to cause harm to anyone to achieve his own power.

Key events:

• The death of his mentor: Vaelarath lost his mentor and teacher at a young age, and this event deeply affected him. He was left alone and without guidance, leading him to seek out forbidden and dark magic to fill the void left by his mentor. This event has influenced Vaelarath's outlook and made him more ambitious, power-hungry, and willing to do anything to achieve his goals.

• The rejection of the dragonborn society: Vaelarath's ambition and thirst for power led him to be rejected by the dragonborn society, who saw him as a dangerous individual. This event has influenced Vaelarath's outlook, and made him more bitter, resentful and willing to betray anyone to achieve his own goals.

• The temptation by the planar entity: Vaelarath was tempted by an entity from another plane who promised him immense power in exchange for his loyalty. This event has influenced Vaelarath's outlook, and made him more corrupted and willing to do anything to achieve his own power, including serving the entity's agenda.

Vaelarath's dark ritual:

Vaelarath was known for his mastery of dark magic, and he began to conduct dark rituals in secret. These rituals involved the sacrifice of innocent dragonborn citizens in order to gain more power and influence through the creation of a new race of loyal draconians. Eventually,  evidence of his dark work was discovered, laying bare his ambition and willingness to do anything to achieve his goals. The dragonborn society saw Vaelarath as a dangerous individual - a monster who was willing to harm his own people. They rejected him and exiled Vaelarath and his creations from their lands. 

Vaelarath's betrayal:

Prior to evidence of his dark rituals being revealed, Vaelarath had been a member of a secret group of dragonborn mages who were working on a powerful spell to protect the kingdom from an ancient enemy. In his rage at being rejected, Vaelarath's ambition and thirst for power led him to betray the group and steal the spell for himself. He planned to use it to regain power and influence within the dragonborn society, but the spell backfired and caused the cataclysm.