Elemental attunement
Attunement is a character's innate tie to a particular elemental energy. These include the prime elements of Air, Earth, Fire, and Water, as well as the composite element of Lightning. It is a one-time permanent decision made via the use of ATTUNE SET <ELEMENT>. Once you have chosen an element via ATTUNE SET, you still have to use ATTUNE ELEMENT in order to focus on the specific element, and can use ATTUNE RANDOM to temporarily release your focus.
Attunement garners no direct mechanical benefits to any spell. For most classes, it only effects the type of element used in the casting of a few spells from the Minor Elemental Circle; specifically Elemental Blast (409), Elemental Blade (411), Elemental Strike (415), and Major Elemental Wave (435).
For a Wizard, Attunement also effects the color of Thurfel's Ward (503) and Floating Disk (511), the type of elemental flare in Weapon Fire (915) and the ability to summon a wyrdling with Call Familiar (920). Wizards also gain additional messaging when using the ATTUNE ELEMENT command.