A lot More Intricate.
The eyes of all who witnessed Ergo's attack were widened in surprise and that included Hal's, although his surprise was followed by recognition.
The gem was obviously an artifact ingredient from the Dystopian continent, or more accurately, the Devil tribe on the Dystopian continent.
Now that he thought about it, Hal realized there was no real reason for surprise.
After all, the organization surely had their plans, plans that usually crossed paths with Tanya's so it was not too much of a stretch that they would do all they could to achieve their aims.
Whatever they might be.
Besides, he was not so naive to think Tanya was not the same.
After all, she had the body of a Dystopian who had a forbidden technique of monsterization (Remember Baldar the Dystopian from Hal's initiation mission for which he went to Black Lagoon back in chapter 310) and was probably researching the said body for anything that could prove useful to her course.