She's got the devil's eyes
There are many in this world who would say Heartfire is a cold and heartless woman. Were that true however, she would have ended this tense stand-off with Lepis and Castile long ago. So, while it may not often appear that way, she does actually care about far more than she ever lets on. And she is certainly not a petty or malicious woman who would eviscerate someone for such a bland, if somewhat probing, request.
Ultimately, her hesitance to answer stems far more from a disinclination to reveal information that, in the wrong hands, could be used against her rather than a desire to be obstinate or difficult. However, the incentive Ruinam had placed before her is one of the very few things that might actually stir her to give him his request.
She considers him quietly for a long moment, noting the sincerity with which he affirms he would stand behind the offer. While it’s just as clear he is coming to understand the import of it, that he would have so much to gain from it seems to outweigh any misgivings he has. Even one so large as giving away something that could just as easily be used against him.
Fortunately (or unfortunately, if it came to pass), Heartfire would be unlikely to use it to destroy him, unless, of course, he made himself her enemy. Still, she had just garnered a very huge incentive for him to remain on friendly terms with her.
“Very well,” she agrees, a note of finality to her voice. A faint smile kicks up her lips for the barest of moments before she continues, “My price is knowledge, freely given. Past, present, and future.” She pauses heavily before finishing, “Agree to that, and I will share with you what you wished to know.”
and they'll cut you like a weapon