You can choose any three of the following elements.
Fire
Water
Earth
Wind
Lightning
Nature
Ink
Sound
Space
Illusion
Arcane*
* Denotes an element every character receives.
This means that they choose any of the three elements and on top of that they receive the Arcane element. The Arcane element is essentially the, "Raw magic" element and will allow unaligned raw magic energy to be used as either shields, blasts of energy, swords of raw nonelemental aligned energy and etc.
You are required to have 4 elements (Arcane and three others of your choosing).