The Use of Death Runes
There is another type of runes is death runes with the exception of three basic rune types such as blood, frost and unholy.
Given that the temporarily replace one of your normal runes and allow you to utilize it to power your abilities, death runes are very Death runes are special as if it was a rune of any needed type. Death runes allow a great deal of flexibility in your combat rotations by allowing you to swap weaker attacks for stronger ones or giving you more chances to utilize your reactive abilities.
Death runes come in two unique ways, one is through Maple Story Mesos talents or unique item bonuses that cause any rune consumed by a specific ability to become a death rune. This change in rune type is temporary, lasting until you either consume the rune, upon which it will return to its default type, or it will revert back to its default state after spending long enough out of combat.