According to ancient record of the Million-Beast Index made from the accumulation of knowledge from countless Geneticist and Gene Mixers, the flames of a matured Blackfire Blossom Queen is rumored to melt a large mountain, turning it into a pool of magma. While this Blackfire Blossom Queen was still in its infant, it was still a Triple-gene mutated plant therefore the temperature of its flame is still high enough to turn sand into glass.
Naturally, the physique of a titan shouldn't have been able to withstand such high temperature especially one with only a single super-gene.