A Mountain
Hearing Rena's words, Alu couldn't help but sneer as he answered.
"Miss, even though you are strong, I thought that if there was someone I couldn't kill, you wouldn't be able to do it either."
Alu admits that the law of killing used by Rena is really so strong that it is dangerous even for those who are stronger than Rena.
But unfortunately that only applies to ordinary people with average techniques. That doesn't apply to Alu.
Although the law of fire is quite general, it is also one of the most dangerous of all.
Of course, compared to the laws of killing, space, or time, the laws of fire may still be much weaker.
But that's only for the common law of fire. Alu's law of fire, however, is no ordinary fire law.
Phoenix flames, it is one of the strongest flames.
People even refer to phoenix flames as Nirvana flames.