Element
From Revival Ragnarok Online
Every person and monster in Ragnarok Online has its own element. The element something is defines its weaknesses and strengths against skills/other elements. The term is often used interchangeably with Property or Attribute.
There are ten different elements:
Players by default start off as a Neutral element. This can be changed by adding cards and/or equipment. If using both, the card that changes the element overrides the armor. So a Dokebi Card put into a Water Armor, will make you Wind element, not Water