Soul

Leonel had already memorized the known Ability Indexes. So, he didn't really need the dictionary to explain anything more to him. 

Seed. Root. Form. Manipulation. Immortality. 

Even if he hadn't memorized these five titles, just by the fact that Wise Star Order was in Tier 5 to begin with was shocking enough. There was only one group of people who could enter the fifth tier… 

Savants. 

Leonel had to say that the creator of these Tablets surely chose well. There probably was no better choice for a Title like Wise Star Order than a Savant with a soul ability. 

Leonel felt like this was a great opportunity, he really wanted to find out how Savants who hadn't been locked up since their youth functioned. From what it seemed, Wise Star Order was kind and even somewhat pitiable.