"…all of this still could affect your body." said Axel from the backline.
Seeing that Ian and the others can handle the invincible holy knight, Otebon and the Sur knights focus on the other assailants with war drums. Although the War God Temple holy knights have broken invincible skills, it doesn't mean they are unbeatable.
In fact, divine skill only gives them invincible bodies, not strength. In other words, they only resist damage and become good punching bags for some battle maniacs.
Moreover, high-elemental magic could still affect and restrict them. Some even said the best way to deal with these people is to bury them alive or use high-concentration poison. There are various ways to deal with their invincible divine skill.
The Dark Matter mist could also heavily restrict this invincible holy knight. It may not fully cancel the invincible divine skill. But, it will continuously deplete the holy knight's divine energy.