The simulated realm was the newly refined private realm imbued with Elysia's divinity and absolute domain expansion. Countless corrupted cosmic creatures above the 11th Rank were prepared in the training hall space in advance, and they would respawn endlessly as long as there was enough energy for it.
The stronger monsters would await at the depths. The monster's rank also determined the total score students would receive on their hunt.
As for how the realm could empower itself, the technology was similar to Vrelenia's Cube Island to self-sustain.
However, since Elysia's imaginary divinity and absolute domain were installed there to regulate everything, the dispersing energy would be absorbed by the space and transferred to Elysia. It would become one of her new farming grounds, the shortcut to fill her SP and MP.
Training never exhausts the mind. Don't dream of winning, just train for it!