Unfortunately, I wasn't able to participate in the King Arthur challenge; still, I had some ideas I wanted to visualize.
"The magic sword was hidden deep into the forest; it's otherworldly power influencing its surroundings. The power it contains being almighty, it's leaking pure energy. The nearer the chosen one comes, the more it leaks."
After sketching out my ideas, I modeled the scene in VR with Oculus Medium, did a few renders with Octane and finished those two shots in Photoshop.