As far as Lex's new abilities were concerned, so long as they were on the list of expected abilities gained in the process of cultivating Regal Embrace, the cultivation technique gave Lex information on them.
For Intuition, however, even if the cultivation technique failed to provide him with an explanation, he would have known. After all, it was in the nature of the technique itself to provide Lex with information about anything related to himself.
For example, currently his intuition was telling him that he should thoroughly master controlling his spirit and soul sense before exiting his room, at least in the guise of the Innkeeper. When Lex's thoughts went to why it was so important he should not appear as the Innkeeper before mastering those abilities, his intuition pointed towards the Host Attire.
While it was not spelling the answer out for him, the hints were big enough. From there Lex could summarize on his own that the Host Attire only granted him complete control of his facial expressions and his body, but that extreme control he had been relying on to maintain his facade would not extend to these two new senses.
Although both the soul and spirit sense were invisible and could not normally be detected, others with spirit and soul senses of their own would be able to detect his if the two touched. At the same time, while Lex was not sure about this, he could venture a guess and say the way emotions such as surprise, anger, happiness, etc. all show up on a person's face, they might show up in the behavior of his senses as well.
For example, if he was startled, his senses might tremble and extend out of his body if he didn't keep them sufficiently suppressed. He could guess this much because even the spirit energy within his body reacted in various ways to his emotions, though those reactions were extremely limited since they were contained within his body.
That was merely one of the simple effects of his intuition. It was simultaneously warning him of various potential avenues of danger, or rather trouble, he had been ignoring, or not giving enough attention to.
The biggest one at the moment was his double identity as Leo. The identity itself was not the problem, but the fact that he wanted to associate that identity with his real identity of Lex, should someone start investigating him. With his name now at the forefront of the Guest registry, he needed to strengthen the relation between Leo and Lex by dropping a few subtle hints.
Then came the issue of why his name was at the top of the list while so many people stronger than him weren't. That was even simpler to resolve. Lex had been using his own name in the Crystal realm and the Midnight tavern, though he had avoided using his last name. He just needed to build a connection between himself there and Leo as well. That way he did not even need to explain his achievement. It would be up to others to use their own imagination about why he appeared in a different realm, and what he did there.
It wasn't as if these were things he had ignored, but apparently he had just not done enough about them to cover his bases. His intuition would help him avoid simple mistakes like that. The best part was, even this was only a portion of what his intuition could achieve. The ability was truly versatile. So long as it related to his physical body in any way, his intuition would guide him.
Up next was his Soul sense. The basics of it were easy to understand. In the way that spirit energy could interact with the physical plane of existence, and send Lex feedback so that Lex could essentially 'see' everything his spirit sense touched, the soul sense could do the same, but for the soul plane.
A brief description of planes was provided so Lex could understand what they were. Basically all of reality, in every realm across the entire universe, consisted of numerous planes that all existed simultaneously and overlapped one another in the same space, and interacted with one another. Normally, living beings could not differentiate them and so perceived them as a whole. The physical plane was one in which matter existed. The soul plane was another plane in which only souls existed.
This concept… confused Lex, and not just a little. That was to say, for normal people, their body existed in one plane of existence while their soul existed in another plane of existence altogether? But if they were in different planes, why did the soul need the body's support to exist? It… for now he just accepted that because the planes could interact with one another, souls could suffer pressure from the physical plane, or maybe some other plane Lex didn't even know about. But this was still something he would look into further.
Getting back to his soul sense, if it could show Lex the soul plane, then what did it look like? Nothing. It was a void of darkness with himself in the center. This was because the soul sense would not detect anything other than souls, and so if Lex only relied on it for sight, in an area like his meditation room where he was the only living being, he would see nothing else.
Of course, as these things usually go, even soul sense was not so simple, and people could find ways to hide themselves from his senses, but for the most part, he would be able to sense any soul with his soul sense.
That was just the basic feature, and the part that Lex understood. The confusion actually arose when he learnt that he could use his soul sense to interact with souls directly, and not only that. When he practiced and got better, he would be able to influence the characteristics of souls to a limited degree - temporarily!
According to the description, this would help him in fields such as alchemy, medicine, forging and many more.
It would take time and experimentation for him to understand what that really meant. For now… he closed his eyes and wrapped his own body in his soul sense, which admittedly took longer than Lex had hoped. Still, the result was satisfactory. He could see his own 'soul' and deep inside it, he could finally see the treasure within which the system was hidden.