The Ex-Machina on a Dimensional Journey

After a brief pause, he turned back to Number Two. "How do I get out?"

The moment he spoke, a Golden Vortex appeared beside him, identical to the doorway through which he had arrived.

Before he could step inside, Number Four called out to him.

"Reminder: take this."

Golden energy gathered in Number Four's hand, forming a small round object in an instant.

Karna reached out and accepted it.

"Explanation: this is an earpiece. Put it in your ear. Once you cross over, Number Nine will speak to you through it."

Karna nodded, put it in his ear, then turned and strode through the Teleportation Gate without delay.

Once Karna was gone, Number Four finished reading the details of the experiment.

"Question: you've already worked out how to exploit that 'loophole'?"

With the outsider gone, Number Four immediately returned to speaking normally.

"That's right. I proposed this experiment precisely because I have a concrete method."

Number One answered. He was clearly eager to see the experiment through.

"Exactly..." Number Two picked up where he left off.

"Having analyzed the Great Holy Grail, we naturally found the loophole in its operation. That puts this experiment's chance of success at eighty-nine percent."

"Question: how can you be sure the individual you summon will be 'me'?"

"Explanation: we start with the summoning ritual itself."

Number Three, silent until now, supplied the answer. Beside him, Number Seven nodded slightly and continued:

"Confirmed: using a holy relic as a catalyst will greatly increase the chance of selecting our target."

"Correct. According to my calculations, the catalyst we chose is overwhelmingly likely to summon the individual we're after."

Number Two supplied the final conclusion.

With everyone before him in agreement, Number Four could only sigh inwardly.

"Understood. As long as you've thought it through. I'm curious