The cold, eerie green phosphorus fire burns on the stone slope beneath the fortress, greatly hindering the Empire Army's efforts to stack stones on the slope.
The stone slope has already piled up to nearly thirty meters high. The towering fortress is conservatively estimated to be thirty-five meters tall, leaving a mere five-meter difference between the slope and the fortress.
Yet, this five meters has become an insurmountable barrier. The temperature of the green phosphorus fire produced by the shattering of the Green Phosphorus Burning Bottles is extremely high. Not to mention the human body, even steel would melt into molten iron.
Although the green phosphorus fire burns for a very brief time, disappearing in about a dozen seconds, the goblins on the fortress continuously throw down Green Phosphorus Burning Bottles to prevent the Imperial Army from advancing further.
