I'll throw an ask up on the FAQ about whether or not latent Flame can be sensed. If not, his 'powers' are 100% mundane, but VERY high-skill. Not sure whether that counts as good news or bad news for Tyzias.
100% bad news. The Zoldycks are probably trained in fighting mages and negating their advantages, and while Tyzias technically isn't a mage, she functions very similarly to one. If she can't sense anything, Tyzias is going to spend an unhealthy amount of time--literally--juicing up her transformation and practicing with it. She'll probably also work on other physical enhancement spells, but the important part is that Killua's mere presence is going to be enough to force Tyzias's first permanent transformation.
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