Sorry to dig at an older thread, but it interests me a great deal. I hate winging it with the elven cat all the time, but we do what we must.
I was suprised to see the entry on the elven horse/Yyllethyn from an issue of Dragon, as I'm more familiar with the elven moon horse known as the Teu'kelytha from Monsterous Compendium Annual Volume Two.
Climate/Terrain: Plains, medows (elven lands)
Frequency: Rare
Organization: Herd
Activity Cycle: Day
Diet: Herbivore
Intelligence: Average to very (9-12)
Treasure: Nil
Alignment: Chaotic good
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No. Appearing: 5-20
Armor Class: 7
Movement: 18
Hit Dice: 4
No. of Attacks: 2
Damage/Attack: 1d8/1d8
Special Attacks: Spells
Special Defenses: Immunity to undead powers
Magic Resistance: Nil
Size: L
Moral: Champion (15)
XP Value: 270
Moon-horses, also known as teu'kelytha, are a race of highly intelligen, magic-using horses that are unique to elven lands. These magnificent animals vary from white to silvery grey in color, with manes ranging from white to black. A moon-horse's eyes are deep and highly intelligent, and its facial expressions reflect a wide variety of moods.
Moon-horses are similar in temperment to the elves whom they serve. They roam freely, but voluntarily serve as elven cavalry mounts when there is great need.
Although they do not speak elvish, they do understand it and can respond intelligently.
Combat: Moon-horses are tough fighters, and far less flighty than ordinary horses. Each moon-horse has the ability to cast one magical spell per day, as determined by rolling 1d10 and referring to the table.
Moon-horses are completely immune to special attacks by undead creatures, including but not limited to aging, charm, fear, level drain, paralysis, poison, and Strength loss. They still take normal damage from physical attack, including chilling touch (as by a shadow), and spells cast by undead creatures.
Habitat/Society: Moon-horses normaly travel in herds of as many as 20 individuals. These are mostly foals and mares, led by a stallion. However, some moon-horses--especialy young stallions--associate voluntarily with elves, serving as companions and mounts.
The horses' association with the elves is a very old one. Ancient legends tell of heroes who rode wise and mighty moon-horses into battle, and of moon-horses who saved their masters at the cost of their own lives. The alliance between the two continues to this day.
Ecology: Moon-horses are quite long-lived, with a lifespan of 200 years or more. However, the breed suffers from low fertility. A mare will bear one or two foals during her entire lifetime. Because of the rarity of foals among the moon-horses, a new birth is a momentous event, celebrated by moon-horses and elves alike.
On Toril, the last herds of moon-horses were transported to Evermeet during the elven retreat from the mainland, and most continue to run free through the island's forests and medows, serving the riders of Queen Amiaruil as needed.
Magical Abilities of Teu'kelytha
d10 Spell
1 Color Spray
2 Magic Missile
3 Shield
4 Sleep
5 Wall of Fog
6 Knock
7 Ray of Enfeeblement
8 Stinking Cloud
9 Summon Swarm
10 Web