Persimmons should be squeezed when they're the softest.
Seeing White Eagle's team layer upon layer of defense made all the Undead Bosses shake their heads; none of them wanted to rush up and get into a head-on fight with this bunch.
This made things difficult for the rest of the foreign teams as they found the Undead army becoming fiercer than ever, as if completely unaware of what death was, fearlessly brave.
In fact, most of the Undead, not particularly intelligent, had no concept of death. They only became fearlessly aggressive because their king had issued a death order.
Of course, those fearlessly fighting Undead were mostly just standard templates, but at the least they were all elite level.
As for the real Bosses, the elite Bosses were equally fearless in the charge, but the rare and hero Bosses hung back, directing their forces from behind while sneakily shooting arrows in the dark.