The Holy Light was a weapon created by using the blessing of the God of light. The defense and regeneration of the corrupted ones were too impressive. Physical attacks and magic were ineffective against them as the corrupted ones were surrounded by chaotic malignant aura.
Strong Physical and magical attacks that can disperse the malignant sura could effectively hurt them but their regeneration was almost unbelievable. They healed faster than they were damaged. Thus, physical attacks and magic were deemed useless against the corrupted ones. Of all the elements, only the element of light was dealing effective damage to the corrupted ones. The light spells were natural bane of the corrupted ones, and they couldn't heal the wounds caused by light. The holy light was ten times more damaging to evil creatures than the element of light.