The first line of defense was broken easily, but that's because they were saving mana for this moment. Zelhart has destroyed the wall from afar and quickly saw a rain of arrows coming right at him.
Normal arrows were doing nothing against him without armor since his skin is tougher now, but mages were enchanting the arrows right before the archers firing, a quick display of teamwork with one fire mage for every 15 archers.
As impressive it was, unfortunately it was not enough to pass through Zelhart's aura, the death that comes not only for the living but even for the objects, turning everything weak into dust.
Kluster was already expecting that, so one archer in each formation that is working with mages was using arrows made of copper and passing through Zelhart's aura.