Kobold priest living in the Sacred Caverns beneath the Insectoid Hive. (Gpx-The Hive)

Later became the commander of the invading Dragul horde.

A Kobold warrior charges through a field of battle. He blows into a horn made of white bone, rallying an army of Dragul warriors to his side. Somehow you know that this is Khathandor (ka-THAN-door), ancient commander of the invading Dragul horde. - Crack in Kulbak (RPA-ADV5) 

Other titles: General of the Dragul Horde. Defender of the Ancient Lands. Keeper of the Mystic Horn

Khathandor was purported to be capable of visiting the dreams of others;

“He wasn’t just a warrior, he was also a prophet. According to legend, he had the ability to travel into the dreams of others, even those who lived in the past or the future. Descriptions of those dreams have been passed down through the generations. This book is considered by many Kobolds to be a sacred text.” - Armaund Ra, Deathmatch at the Colosseum of Ashes (RPA-SQ1)

One such dream, recorded in The Dreams of Khathandor is particularly noteworthy;

Khathandor describes reliving a famous battle with a hero from the future — someone who was once a member of the King’s Guard, but would later be known as the King’s Assassin. - Deathmatch at the Colosseum of Ashes (RPA-SQ1)

It is told by the Kobolds that Khathandor bested the Immortal Knight in the Colosseum of Ashes;

“The Immortal Knight was defeated in the Colosseum by my great ancestor, Khathandor,” he explains. “At least, that is what is said in the stories of my people. Khathandor was the greatest Kobold warrior to ever live. No Human was ever his equal.” - Armaund Ra, Deathmatch at the Colosseum of Ashes (RPA-SQ1)

You see the forces of Khathandor and those of the Immortal Knight about to clash on the battlefield in a dream your first night at Kulbak Prison:

• Aid the Dragul:
  • Succeed, and overcome the Immortal Knight.
  • Fail, and be taken away.
• Rally behind Nalos:
  • Succeed, and overcome Khathandor.
  • Fail, and the Dragul emerge victorious.

An encounter with the Starlit Door shows you that Khathandor's spirit is still here beneath the Prison;

You drift into the cell block, passing through the back wall of your cell and find yourself in the prison’s catacombs. There are many spirits here, but one in particular catches your eye: a Kobold Warrior holding a magical horn of white bone. - Tome of Encounters (RPA-ADV5)

Later when exploring the Catacombs of Kulbak, you find the resting place of Khathandor:

• Move along and let his spirit rest.
• Enter the crypt and steal the horn he was buried with:

The bones of a Kobold warrior dressed in full armor lie on a stone slab, his hands folded across his chest and clutching a horn. You take the horn from Khathandor’s hands, but his body clings to it even in death. You are forced to rip it from his grasp. - Crack in Kulbak (RPA-ADV5)

• Overcome the spirit of Khathandor in battle.
• Fall to Khathandor as his spectral form passes through you.

If you released the restless spirit of Khathandor, it is next seen at the Giant Mangrove of Bogroot Swamp, conversing with the Demon Elsifor about how you can placate him:

• Have a trial by turtle:
  • Pass the test, and Khathandor lifts your curse.
  • Fail, and he strips his horn you stole from him.
• Make a blood offering to Urk-an-bak, Kobold god of vengeance:
  • Make a worthy sacrifice, and Khathandor lifts your curse.
  • Fail, and he strips his horn you stole from you.

During the reign of Queen Gimnax, Khathandor is first encountered as a highly respected priest in the Sacred Caverns of the Insectoid Hive;

One of the priests removes his hood, and you are surprised to find that he is a Kobold. He introduces himself as Khathandor.“ - The Hive (GS-ADV3)

He admits he had grander dreams for himself on the battlefield prior to arriving at the Hive;

“I had dreams of becoming a soldier, but my father did not want to lose another son to war. He sent me here.” - The Hive (GS-ADV3)

The Dreams of Khathandor is a journal of the Dragul commander's sleeping visions.

One notable excerpt is recorded below:

Tonight’s vision offered nothing but despair. I saw the Immortal Knightturn his back on Azema’s cause and lead the armies of Nalos against us, driving us north, beyond the gate. I watched helplessly as the few Dragul that remained behind were dragged off in chains. I saw further into the future than I ever have before. I wandered aimlessly through a prison and cried for my people to rise up against their oppressors, but they could not hear me; they could not see me. I sounded my horn to rally them to my side, but the call to war fell on deaf ears. - Crack in Kulbak (RPA-ADV5)