The [Elemental Energy Invasion] can only be effective if it cooperates with the flawed spells and alchemical products. Under the situation of deliberate planning, the entire envoy group fell into the ambush of the Faceless Person.
On full-face armor made of metal, numerous alchemical devices and magical arrays can have negative effects on the wearer when they malfunction, including unconsciousness, near-death, suffocation, and so on.
The Faceless Person presumably utilized these alchemical devices and arrays to incapacitate the wearers of the armor.
Having completed this step, it was equivalent to sentencing all members of the envoy group to death. They would suffer the pain of [Spirit-Flesh Separation] until they perished. The full-face metal armor has become their coffin.
When the smoke clears, the shocking event of collective death will plunge the Holy Place into chaos.