Since her techniques didn't have as much form as most people, Remelia was looked down upon for a very long time.
She could have just reached a point in power where her reputation would be undeniable. She eventually did do that. However, before she became widely regarded as a genius, she had to find a way to make people recognize her.
Remelia had two sides.
The first was the cold-blooded killer who used invisible heat to decimate the enemy.
The other was a lunatic. A killer who operated on insanity.
She delegated the first side to those who were weaker than her.
For those people, she didn't need to use extravagant techniques with wide-ranging implications. She could just use the invisible haze to slaughter them.
It was the same for when she needed stealth.
However, against opponents who could prolong a battle and find methods to defeat her, she acted in such a way that they couldn't do a single thing in response.
