Thermal Bomb.
It belonged to conventional weaponry, yet it possessed the extraordinary lethality and destructive power just shy of nuclear weapons.
During the initial explosion, the thermal bomb would spread an indomitable cloud of fire.
Then came the secondary explosion.
At that moment, the dispersed cloud of fire would be directly ignited, with the accompanying shockwave lasting long and packing a considerable punch; it could also swiftly consume the oxygen in such an underground environment, causing death from asphyxiation due to the lack of oxygen.
By the time guessing magic and Ghost Flame reacted, it was already too late to dodge.
Although both individuals had Soul Power that had broken through the 10-point mark, they were still made of flesh and blood. Faced with the formidable might of these "sub-nuclear weapons," they had to find a way to save themselves.
It was almost instantaneous—
Guessing magic bellowed, "To die for the dead!"