ElfClash: Realm of Lanai Player's Guide (2004)

From publisher blurb:

Forget what you know, or think you know, about elves. They are not the fragile, merry creations they are thought to be. This book will tell you of a realm run by these ruthless races, about their vicious wars, and about the fearsome reign of evil-minded kings in a land where the true ruler is greed itself.

• 7 Elf Subraces. Some may be familiar, but others are unlike any elf encountered, such as the winged Skie Elves, and the Tali, a shapechanging elf. There are also variant dwarf, halfling, and human races.
• 10 Core Classes. These feature variant bard, cleric, druid, fighter, paladin, and ranger classes. This section also includes two alternative spellcasting classes; the Arcane and the Elementalist, utilizing two new magic systems. Finally theres the Rogue and the Scholar.
• Many of the new classes utilize a variation of abilities.
• A reputation system, new skills, feats, equipment, and a map of Lanai are all included.