Other than Blake, Shuoen, and Melina, no one knew about Hilia purifying chaotic pollution.
The combination skill Rose mentioned could only be used to block out pollution, meaning it only worked in the Golden Apple Stone Forest, so there was nothing to hide.
However, Hilia hadn't used it yet, and she wasn't clear about the details—she needed to learn a weaker version of [Wind Domain] before she could try it out.
The other two magics, [Holy Dispel] she already knew well, and [Shadow Binding] she didn't intend to learn, since it would affect her Holy Word Skill.
She planned to draw it into a scroll and achieve the same effect through Elemental Harmony—in fact, she could do it without Elemental Harmony, but the magic's strength would drop considerably.
Apart from this, Hilia also planned to share with Blake the Purification Skill Rose taught her, specially aimed at pollution and heretics.
This kind of thing really didn't need to be kept secret.
