Su Lun didn't know about the Empress's secret order.
He just felt that the Royal Army being so decisive in entering meant they were relatively sure of themselves.
Those guys were carrying "Nelgale's Death Battle Flags," clearly well-prepared.
The place was full of "spectral" undead monsters, many of whose attacks were psychic in nature, such as fear, hallucinations, wails... For ordinary people, especially those with strength-based professions, it would be extremely troublesome.
But this battle flag could shield and slow almost all negative statuses, effectively countering them.
With this method, the fighting power of the Sacred Judgment Army would not diminish too much.
Su Lun roughly estimated the level of monsters in the cursed space and began to believe they really could bulldoze their way through.
Normally, the ranks of monsters in cursed spaces wouldn't exceed their ranks in life.