Water

Water is an essential part of all elemental games. It is generally considered the last element in this list, order as: Air, Earth, Fire, Water.

Importance
Water is necessary for life, so everyone needs it.

This element is a key part in making elements. Without it, the game wouldn't be considered "elemental".

Water is key for both alchemy, and a common elemental for fantasy.

Trivia

 * After the Second Break of the Game, many people didn't have this element, due to it being a main element.
 * Water has the highest amount of combinations of the starter elements, twice the size of air.
 * Water's chain is one of the most famous chains, not only in EoD, but in user-suggested elemental games in general.