Dakianus explained it like this.
The effect of the blue Dilleria is so tremendously powerful that, if mishandled even slightly, it could become a horrific poison that completely severs the soul from reality.
So, after long years of research, he devised a tangyak that minimizes side effects as much as possible. Of course, the potency of Dilleria diminishes accordingly, but he said that if one consumes it steadily over a long period with dedication, one could surely build a sturdy fortress for the soul.
“But Dilleria is a rare ingredient. Didn’t Dakianus also say that he created a secret garden to monopolize those flowers?”
From there, Seongjin let his thoughts leap a little.
The era when Dakianus, the founder of the marquess family, was active dates back hundreds of years already. If so, the knowledge he spread might have been shared with someone and secretly passed down through the shadows.
And they likely searched for something to replace Dilleria in pursuit of the dream of immortality. For example, things like the eggs of Lopeum, which give off a fragrance similar to Dilleria.
“In other words, the eggs of Lopeum were used as a lesser substitute for Dilleria!”
If that’s the case, one could somewhat infer what Dakianus meant by the “fortress” of the soul.
The most comfortable place for the soul to dwell.
That is—
“Mind Crystal!”
The medicinal tea showed the effect of extremely activating Seongjin’s Mind Crystal. That means the eggs of Lopeum are a sufficiently grounded substitute.
Just like Dakianus’s tangyak, if…