A variant of the elf class with a nod to OD&D.
The rest of this post is designated Open Gaming Content according to the Open Gaming License.
Of the many species of elves, phase elves are perhaps the oddest. They originate from an inter-dimensional space which is inaccessible to other races, and about which they never speak.
Physically they appear similar to other elves -- tall and slender, with elegant features. It is, however, always possible to identify a phase elf by his or her eyes, which are either pure black or pure white, without an iris or pupil. Their hair also tends to be of unusual hues such as violet or cyan (though this is not unknown in other species of elf).
What makes phase elves truly unusual is their double personality. Each individual has two independent but interconnected personae. The two personae usually share the same name, and have complete knowledge of the other's actions, but their personalities and goals are often at odds. The two personae are sometimes even of different alignment. On any given day, only one of the two personalities is manifest in the physical world, the other having shifted into the phase dimension.
A phase elf PC thus has two classes -- magic-user and fighter -- one for each personality. At the start of each game day the player can choose which personality manifests. The phasing of personalities typically occurs at the moment of waking in the morning. When a phase elf switches personalities, the only noticeable change is that the colour of his or her eyes invert (white becomes black, and vice versa). However at the moment of phasing the character's personality and class abilities switch.
When a phase elf's fighter persona is manifest, the character functions exactly as a fighter, losing all spell-casting ability. Likewise, when the character's magic-user persona is manifest, he or she gains the ability to memorize and cast spells, but must abide by the armour and weapon restrictions of the magic-user class.
Both personae share the same hit points (d6 Hit Dice), and use the same saving throws (the standard elf matrix). Attack rolls are made using either the fighter or magic-user matrix, dependant on the manifest persona.
Phase elves use the magic-user experience table, and can advance to a maximum of 8th level.