One-eyed Labelas Enoreth is said to be the power who measures out the elven life span and decrees when it should be cut. He doesn't worry about any particular individual, preferring to see the race as a whole - fact is, the story says he traded an eye for the ability to peer through time. It's Labelas who makes the elves nearly unblemished by the passing of the years, and he eases each new generation into an understanding with the last. The deity confers wisdom and teachings on young and old alike, and he's rarely invoked but often praised.
Labelas is known to reside in Arvandor, but the exact location is dark. Some claim his case is locked away under one of the huge hills of the realm, while others tell that it's just a vanishing tower, appearing only as a harbinger of trouble (or as a portent of the appearance of a new leader among mortal elves).
Labelas gets on well with the rest of the Seldarine, but he makes allies of few other powers. He an Chronepsis of the dragons have an understanding, and it's aid that Labelas is looking to establish ties with Shekinester (though the naga deity is holding him off at the moment).
On the other hand, Labelas is a well-known enemy of the powers of entropy, probably because his aims are geared far more toward the preservation of matter than its destruction. A particularly vexing foe is Yeenoghu of the ghouls and the gnolls, though other powers of the undead also draw the Lifegiver's wrath.
Labelas' main proxy is a Torilian elf called Vartan Hai Sylvar, a mortal brought from the Prime Material Plane to serve the one-eyed god. The two had a falling out some time ago, but apparently they've mended the bridges; Vartan now works with Labelas quite willingly. Oddly, neither say that Vartan actually serves the power, but only that he aides Labelas by choice. And for this, Vartan can, at will, cause any sod he touches to immediately age 20 years.